From the Philosophy of Metrics website:
Back on September 30, 2015 I published a piece titled "The Bretton Woods Origin of the Cold War". In the article we reviewed how Harry Dexter White, the American leading the Bretton Woods negotiations in 1944, used counter-espionage tactics to trick the British and Soviets, along with other allied nations, into accepting the use of the USD as the international reserve currency.
British economist John Maynard Keynes and the Soviets were expecting to be using a true international currency called bancor as the unit of account in the new international monetary framework. The British were tricked into signing the agreement but the Soviets caught the play and refused to sign, which set off the tension which eventually evolved into the Cold War.
Source - https://philosophyofmetrics.com/democrats-against-the-international-banking-interests/
You guessed it - the first Cold War started because of the US desire for world domination.
And not surprisingly, the second Cold War has its roots in the very same thing.
The Russians became a "threat" because they foolishly demanded (and still do) to be treated as equals, which the US will never do.