Which economic activity has lagely driven devolopment of modern southeast asian city's

Trade routes

Trade routes were used for the commercial transport of cargo. This logistical network allowed goods to reach distant markets. One trade route contains arteries that are connected to smaller networks of commercial routes.

Early in history, Asia needed good maps because of the extensive overland and maritime trading between lots of states as well as kingdoms.

it had little to do with the us which only led them to get involved after the bombing of Perl harbour

Explanation:

us had little care for everything that was happening