The Atlantic World, a pentagonal region encompassing one twelfth of the Earth, includes the Azores, Madeira, northwestern Europe (including western Denmark and western Norway), the British Isles, the Orkney Islands, the Shetland Islands, the Faroe Islands, Iceland, Greenland, Newfoundland, eastern and central North America, the northern section of Hispaniola, and several smaller island groups, notably Bermuda, the Bahamas, and the Turks and Caicos.

The eastern boundary, marked at 10° east longitude, divides Scandinavia into Eastern and Western sections, with Western Scandinavia oriented toward the North Atlantic and Eastern Scandinavia centered on the Baltic Sea Basin. This boundary also aligns with the historical eastern border of West Germany (1949–1990), before terminating in south-central Germany at its junction with the neighboring region to the southeast.

The western boundary, at 110° west longitude, cuts through Canada, separating the northern districts of Nunavut and the Northwest Territories from Alberta and Saskatchewan, approximately 75 miles south of the Alberta-Saskatchewan-Montana junction (48.1896851°N)—the northernmost point of the neighboring world to the southwest.

The southwestern boundary follows the division between the upper and lower Mississippi River Basin, then extends eastward into the Atlantic Ocean just south of Jacksonville, Florida, before terminating in northwestern Hispaniola.

HistoryAtlas contains 18,139 entries for The Atlantic World from the Paleolithic period to 1899.

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The Moderns are taller, more slender, and less muscular than the Neanderthals, with whom they share—perhaps uneasily—the Earth.

Though their brains are smaller in overall size, they are heavier in the forebrain, a difference that may allow for more abstract thought and the development of complex speech.

Yet, the inner world of the Neanderthals remains a mystery—no one knows the depths of their thoughts or how they truly expressed them.

The fearsome cave bear (Ursus spelaeus) likely became extinct around 27,800 years ago, according to recent fossil reassessments.

Rather than a single cause, a combination of factors is believed to have led to its extinction. While overhunting by humans has largely been dismissed—since human populations at the time were too small to pose a significant threat—evidence suggests that cave bears and humans may have competed for shelter, particularly in caves.

Mitochondrial DNA research indicates that the cave bear's genetic decline began long before its extinction, ruling out climate change-induced habitat loss as the direct cause. However, a recent DNA study suggests that cave bear populations started declining around 50,000 years ago, coinciding with an increase in human populations.

Unlike its close relative, the brown bear, the cave bear was highly dependent on a vegetarian diet, making it less adaptable to environmental changes. Additionally, evidence suggests that cave bears exclusively used caves for hibernation, unlike brown bears, which could hibernate in thickets or other natural shelters. This specialized hibernation behavior likely contributed to high winter mortality when suitable caves were unavailable.

As human populations gradually expanded, both Neanderthals and anatomically modern humans increasingly occupied caves as living quarters, reducing the availability of essential hibernation sites for cave bears. Over time, this competition for shelter may have contributed to their gradual extinction.

Interestingly, cave bears are rarely depicted in prehistoric cave paintings, leading some researchers to speculate that human hunters may have avoided them, or that their habitat preferences simply did not overlap with early human settlements.

As humans develop more advanced skills and techniques, evidence of early construction begins to emerge.

Fossil remains of Cro-Magnons, Neanderthals, and other Homo sapiens subspecies have been found alongside foundation stones and stone pavements arranged in the shape of houses, suggesting a shift toward settled lifestyles and increasing social stratification.

In addition to building on land, early humans also develop seafaring technology. The proto-Australians appear to be the first known people to cross open water to an unseen shore, ultimately peopling Australia—a remarkable achievement in early maritime exploration.

Around 55,000 years ago, global weather patterns begin to fluctuate dramatically, shifting from extreme cold to milder conditions and back within just a few decades.

By 50,000 years ago, the Wisconsin glaciation (known in Europe as the Würm glaciation) is well advanced. Expanding ice sheets in North America and Europe push climatic zones southward, transforming the temperate regions of Europe and North America into Arctic tundra-like landscapes. Meanwhile, rain bands typical of temperate zones shift south, reaching as far as northern Africa.

Neanderthals and Climate Adaptation

The Neanderthals, well adapted to cold climates with their barrel chests and stocky limbs, are better suited than Cro-Magnons to retain body heat. However, the rapid and unpredictable climate fluctuations cause ecological upheavals, replacing familiar plants and animals within a single lifetime—a shift to which Neanderthals struggle to adapt.

One major challenge is the replacement of forests by grasslands during the Mousterian Pluvial, an effect of the last Ice Age’s climatic shifts. This change disrupts the Neanderthals’ ambush-based hunting techniques, making it harder for them to secure food. As a result, large numbers of Neanderthals likely perish due to food scarcity and environmental stress, with the crisis peaking around 30,000 years ago.

Neanderthal Burial and Final Strongholds

Despite their decline, Neanderthals appear to be the first humans to intentionally bury their dead, often in simple graves. The last known traces of Mousterian culture, though lacking human remains, have been discovered at Gorham’s Cave on Gibraltar’s remote south-facing coast, dating between 30,000 and 24,500 years ago.

Possible Scenarios for Neanderthal Extinction

Several hypotheses attempt to explain the disappearance of the Neanderthals from the fossil record around 25,000 years ago:

1. Complete Extinction and Replacement: Neanderthals were a separate species from modern humans and became extinct due to climate change and/or competition with Homo sapiens, who expanded into their territories starting around 80,000 years ago. Anthropologist Jared Diamond suggests that violent conflict and displacement played a role in their demise.

2. Interbreeding and Absorption: Neanderthals were a contemporary subspecies that interbred with modern humans, gradually disappearing through genetic absorption.

3. Volcanic Catastrophe: A Campanian Ignimbrite super-eruption around 40,000 years ago, followed by a second eruption a few thousand years later, may have severely impacted Neanderthal populations. Evidence from Mezmaiskaya Cave in the Caucasus Mountains of southern Russia supports this theory, with mitochondrial DNA (mtDNA) analysis showing a distinct Neanderthal lineage separate from modern humans.

Energy Needs and Survival Challenges

Neanderthals had higher caloric requirements than any other known human species. They required 100 to 350 more calories per day than an anatomically modern human male (68.5 kg) or female (59.2 kg). This higher energy demand may have made them especially vulnerable when food sources became scarce, further contributing to their extinction.

Ultimately, by 25,000 years ago, Neanderthals disappear from the fossil record, leaving behind traces of their culture—but no direct descendants in the modern human genetic lineage.

The debate over the origins of Europeans has often been framed as a question of cultural diffusion versus demic diffusion.

Both archaeological and genetic evidence strongly support demic diffusion—the idea that a population spread from the Middle East over the last 12,000 years, gradually replacing or assimilating earlier groups.

However, some researchers have challenged this view using the genetic concept of Time to Most Recent Common Ancestor (TMRCA). This approach has been used to argue in favor of cultural diffusion, suggesting that technological and cultural advancements spread without significant population movement.

The debate remains ongoing, with scholars examining the complex interplay between migration, gene flow, and cultural exchange in shaping Europe's early populations.

Migrants from Central Asia and the Middle East are believed to have colonized Europe, moving northwestward over time.

By the time anatomically modern humans first enter Europe, Neanderthals are already well-established in the region. The question of whether these two populations interbred remains a subject of ongoing debate.

Evidence suggests that modern humans and Neanderthals coexisted in various regions, including the Iberian Peninsula and the Middle East, where interbreeding may have contributed Neanderthal genes to early Paleolithic Europeans and, ultimately, to modern European populations.

Regardless of whether interbreeding occurred, it is generally believed that early human populations took refuge in hypothetical Ice Age shelters, later repopulating Europe as the glaciers receded—forming the ancestral foundation of present-day European populations.

An alternative theory proposes that modern Europeans primarily descend from Neolithic populations originating in the Middle East, whose migrations into Europe are well documented.

Modern human culture begins to evolve at an accelerated pace, marking a significant shift in behavior and innovation.

Some anthropologists, notably Jared Diamond, author of The Third Chimpanzee, describe this period as a "Great Leap Forward." During this time, modern humans adopt new cultural and technological practices, including:

• Burying their dead, often with grave goods, suggesting ritual or symbolic thought,
• Crafting clothing from hides, improving survival in colder climates,
• Developing advanced hunting techniques, such as trapping pits or driving animals off cliffs, and
• Creating cave paintings and other forms of artistic expression.

As human culture advances, different populations begin to introduce novelty into existing technologies. Unlike earlier hominins, modern humans show regional variations in artifacts such as fish hooks, buttons, and bone needles, demonstrating a previously unseen diversity of tools and personal items.

Anthropologists identify several key markers of modern human behavior, including:

• Tool specialization,
• Adornment with jewelry and symbolic imagery (such as cave drawings),
• Organized living spaces,
• Elaborate rituals, including burials with grave gifts,
• Exploration of harsh or previously uninhabited environments, and
• The development of barter trade networks.

Debate continues over whether these advancements were the result of a sudden cognitive "revolution"—sometimes called "the big bang of human consciousness"—or whether they emerged through a more gradual evolutionary process.

The development of stone tools appears to have progressed in gradual steps until around 50,000 to 40,000 years ago.

Each successive Homo species—from H. habilis to H. ergaster to H. neanderthalensis—began at a higher technological level than its predecessor. However, once a phase began, further innovation remained slow, reflecting a culturally conservative approach to tool-making.

Around 50,000 BP, however, modern human culture began to evolve at a significantly faster pace. While Neanderthal populations typically displayed little variation in their tool-making techniques, the Cro-Magnon immigrants introduced increasingly refined and specialized flint tools, such as knives, blades, and skimmers.

Additionally, Cro-Magnons expanded beyond stone, pioneering the use of bone tools, marking a major advancement in prehistoric technology.

During this period, Neanderthals are gradually being displaced as modern humans expand into Europe.

The slow pace of human migration into Europe suggests that Homo sapiens and Neanderthals may have been in continuous competition for territory over an extended period.

Neanderthals, with their larger, more robust frames, were likely physically stronger than modern Homo sapiens. Having inhabited Europe for over 200,000 years, they were also better adapted to cold climates, giving them a potential survival advantage in harsh Ice Age conditions.