What was the Marshall Plan? How did this contribute to tension between the U. S. and the Soviet Union?

The Marshall Plan was an economic initiative funded by the United States that provided aid to Western European countries following the end of WW2. This helped contribute to the growing post-war tensions between the US and Soviet Union because the Soviet Union and its satellite states refused all aid from the Marshall plan because it was believed to be an attempt to weaken Soviet influence over their satellite states.