Help me plz

What is an example of a secondary source?

Which of these statements describes a long-term impact of european imperialism in africa? a. african countries joined together to present a united front against imperialism. b. europeans paid african countries after colonizing them, offering these new countries a fresh start. c. european powers drew the current borders, splitting ethnic groups among modern countries. d. africans became more loyal to their countries than to their ethnic groups.

Demographers can compare a choropleth map to a to understand how geography influences population distribution and there are no a,b,c,or d u have to find it out ur self asap