Answer:
A civil war between neighboring tribes
"<em>There can be no friendship and harmony with white people; we must learn to live seperately</em>." were words said by Marcus Garvey who illustrates the importance of blacks to start and own businesses and creation of social institutions for blacks through the United Negro Improvement Association which he founded. Marcus also revealed that blacks had no desire to be white they were proud of their race. Marcus further believed that true reconciliation with whites was impossible; therefore he urged blacks to build up their own communities and plan for a future that would be separate from the white world.
People were moving to New cities
Well disease spread out to the native groups, causing them to die, which i think let the British get the land. they wanted to take over land and let the people transfer to christianity. but unfortunately most died so yeah.
i hope this helps a bit :)