Here are the answers to your questions:
Question 1:
The correct statement about how boundaries created by European nations in Africa affected the African peoples is:
Boundaries drawn by European nations strengthened some divisions between African ethnic groups and weakened others.
Question 2:
The two African nations that remained independent after the Berlin Conference are:
Liberia and Ethiopia.
Question 3:
The statement that best investigates the relationship between social Darwinism and New Imperialism is:
Social Darwinism portrayed White Europeans as culturally superior to other races and was used to justify the colonization of other nations.
Question 4:
The statement that best summarizes U.S. foreign policy goals from the perspective of peacemaking is:
The U.S. foreign policy in the Caribbean intended to provide stability and peace in an unstable region.
Feel free to ask if you have any more questions!