HELP PLEASE 20 POINTS ONE QUESTION What was the purpose of Kennedy's quarantine speech during the cuban missile crisis!?!?!?

Rivalries between european imperialist powers and the growth of european militaries contributed to which outcome in the early 20th century? o a. many european powers were eager to go to war with one another. o b. european states became less concerned about controlling overseas empires. o c. small countries became more willing to join powerful empires. o d. the alliance system that maintained a balance of power in europe broke down.

Why did river valleys most farming impact the lives of neolithic peoples?

Which is not an abundant natural resource found in africa?