Which of these is a negative consequence of the Columbia exchange 1. Diseases killed millions of Native American

2.millions of Africans were enslaved and moved to the Americans

3.new species of plants and animals threatened native Americans

4.all the above

Need plz? due in 10 will give brainliest which of the following was the most significant aspect of revel's election to the senate? a.his election showed that the u.s. would quickly move past the civil war. b.his election to uphold the thirteenth and fourteenth amendments which gave freed slaves citizenship and voting rights. c.his election demonstrated the states were united in a union once more. d.his election was the first step in opening doors for other african-american political leaders.

Why did france demand that germany repay their debts in foreign currency?

During the eisenhower administration, the u.s. began to take an active military role supporting the government of o o a. south africa o b. burma (myanmar) o oc. finland od. south vietnam