What were 3 issues that led to hard feelings between the soviet union and united states

Why is ivan iv known as “ivan the terrible”?

It can be inferred that the dramatic increase in defense spending by germany was the result of. (a) attempts by great britain to take german colonies. ( b) fear of a two-front war against france and russia (c) the need to put down a communist rebellion (d) a competition with the allies to produce atomic weapons

What did the u. s. want to build on the land acquired through the gadsden purchase?