> We allied with the Soviets during WWII, but then we quickly started the cold war

So, about starting the cold war.

USSR meddled in Poland's elections

USSR basically invaded Persia and tried to annex a part there.

USSR tried to force Turkey to gave up control over Bosphor Straits

USSR blockaded Berlin effectively putting people on verge of dying from hunger

... but somebody else started the cold war, absolutely out of the blue?