What was the main resource Europeans exporting from African, especially the Portuguese, starting in the 1500s?

Ineed asap! ! what is the name of the system in which each branch of the u.s government can limit the actions of the other branches? a. perpetual union b. division of powers c. cooperative federalism d. checks and balances

Imagine you are a historian studying a battlefield journal written by a soldier serving in world war i. describe the process of interpreting the information within the journal, as well as how you would determine whether the evidence in the journal is valid

Choose the right phrase to complete the sentence. segregation in the united states in the late 1800s and early 1900s was supported by law alone. by custom alone. by both law and custom.