What roles have geography and trade played in forming southeast asia's culture?

 Virtually all of Southeast Asia lies between the tropics, and so there are ... Southeast Asia became a meeting place for trade between India and China

Explanation: A remarkable feature of Southeast Asia is the different ways people have adapted to local environments. In premodern times many nomadic groups lived permanently in small boats and were known as orang laut, or sea people.

is there a year set? the question is incomplete