What was the united states' major concern about their former ally, the soviet union? a. that the soviets would never leave berlin b. that the soviets would never leave iran c. that the soviets would join the united nations d. that soviet-style communism would take over the world

D.that Soviet-style Communism would take over the world

Explanation:

The US, England and the USSR met at Crimea, in the Yalta Conference, shortly after the war was over. They pointed out the new policy for the "New World order", and soon differences emerged between Stalin and Roosevelt & Churchill.

The vision of a world dominated by a communist country that would expand to take over adjacent countries and eventually become rival to the U.S. in the globe was a major concern that provoked the Cold war.

The Soviet influence in the European stage quickly became a focus of major tensions and the peak of the tensions became when Berlin Airlift occurred, only to be followed by the Cuban Missile Crisis.

In both cases, ever-present fear of an assumed threat from the Communist world was in the discourse, policy and spirit of the Cold war era.

four sitting presidents have been assassinated while in office but the first was abraham lincoln,

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.