How did European exploration/expansion in Southeast Asia influence the areas it had contact with?

the dominoes began to fall. the surrender at appomattox took place a week later on april 9. while it was the most significant surrender to take place during the civil war, gen. robert e. lee, the confederacy's most respected commander, surrendered only his army of northern virginia to union gen. ulysses s. grant

explanation:

it proved indian land claims were unjustified.

i don't really understand the question