Which year marked the beginning of the Cold War with significant policy shifts in the United States?

The year 1947 is significant in the context of the Cold War because it marks the introduction of pivotal policies that shaped U.S. foreign relations in response to the Soviet Union's growing influence. One of the most critical developments in 1947 was the announcement of the Truman Doctrine, which established the U.S. commitment to containing communism worldwide. This policy signified a shift from isolationism to a proactive stance in global affairs.

Additionally, the Marshall Plan was proposed in 1947 to aid in the economic recovery of Western European nations, further solidifying the divide between the capitalist West and the communist East. These policy shifts were particularly important, as they dictated how the U.S. would engage with the Soviet Union and other nations during the ensuing decades of geopolitical tension. The strategic decisions and ideologies established in 1947 set the stage for the ongoing conflict that defined the Cold War.