The Marshall Plan was an American initiative to aid Western Europe, in which the United States gave over $12 billion in economic assistance to help rebuild Western European economies after the end of World War II. The plan was in operation for four years beginning on April 3, 1948. The goals of the United States were to rebuild war-torn regions, remove trade barriers, modernize industry, improve European prosperity, and prevent the spread of Communism. The Marshall Plan required a lessening of interstate barriers, a dropping of many regulations, and encouraged an increase in productivity, trade union membership, as well as the adoption of modern business procedures.