Analyze how islam spread along southeast asias trade routes

I don't know the exact answer but i will try to help. I believe because as the Islam traded with asia, the merchants had to take long, harsh trips to get to South east Asia and so many stayed and sold their contents there instead of risking their health and even their lives to travel back to their home.

Americans often speak of their country as one of several large regions.  these regions are cultural units rather than governmental units --  formed by history and geography and shaped by the economics, literature and folkways that all the parts of a region share. what makes one region different from another? a region's multicultural heritage as well as distinct demographic characteristics like age and occupation make regions different and special. within several regions, language is used differently and there are strong dialects. there are also differences in outlook and attitude based on geography.