What caused suspicions between the u. S. And that soviet union during world war 2?

Why did the north agree to the missouri compromise? a.) it allowed maine to enter the union as a free state. b.) it repealed the fugitive slave law. c.) it allowed california to enter the union as a free state. d.) it banned slavery in the northwest territory.

What was the result of delegates from the democratic party not being able to nominate a candidate in 1860

Who did the first work in creating vaccines