It certainly brought SEA to the world's attention for one. It created a second language (French) and a new religion or two (Catholic), caused a few evolutions in dress, road construction, and architecture. And last, but not least, this led to the French and American and Indian Wars.
The British won the war.
The British, by capturing the capital of New France, Quebec, in the Battle of Quebec in 1759.
Imperialism caused widespread racial discrimination and income gaps as the rich get richer.
butt
they were homeless.
Indochina
The only country in southeast Asia that was not fully absorbed by one or another European empires was Thailand. Japan also avoided that fate, but Japan is in east Asia, not Southeast Asia.
Great Britain
I need to do a report on causes and effects of Imperialism on South East Asia, who rule and how during that time
France and Britain; although Britain concentrated more on southern and southwest asia.
For the most part they opposed it. Some of the wealthy connected individuals may have supported it.
Trade routes to Europe and Asia were opened and maintained.
2nd religion, 2nd language, exposure to the culture ruling over it.
decision to join the League of Nations
The Eastern Hemisphere, slightly above the equator.