How did Eisenhower's decision about taking Berlin affect the future relations between the West and the Soviet Union?

I assume that you are referring to the decision made by Gen.
Eisenhower during WWII, the one in which he allowed the Soviet Army to take Berlin instead of
having the Western Allies do so.

Once the Soviet Union had Berlin
and much of Eastern Germany, the basic shape of the Cold War was set. This made it clear that the
West and the Soviets were going to have to "live" together in some way rather than simply having
their separate spheres that did not interact. This led to such things as the Berlin Airlift, the
Berlin Crisis of the late '50s, and the creation of the Berlin Wall. All of these increased
tensions between the West and the Soviets.

In this way, Eisenhower's
decision ensured that there would be tension between the West and the Soviets because they would
have to have a great deal of contact with one another.