Thai influence grows in the following years until challenged by Western powers.

In 1795 the Thai seize the provinces of Battambang and Siem Reap in Cambodia, where throughout the first half of the next century Chakkri kings will resist Vietnamese incursions.

The conflict between the Thai and the Vietnamese is resolved finally by a compromise providing for the establishment of a joint protectorate over Cambodia.

The Thai also press their claim to suzerainty in the Malay state of Kedah in the face of growing British interest in the peninsula.

As a result of the Anglo- Burmese War (1824-26), Britain annexes territory in the region that had been contested by the Thai and the Burmese for centuries.

This move leads to the signing of the Burney Treaty in 1826, an Anglo-Thai agreement that allows British merchants modest trade concessions in the kingdom.

In 1833 the Thai will reach a similar understanding with the United States.