When did the the US become a first world country?

The term "First World" originated during the Cold War to describe countries aligned with NATO and capitalism, primarily the United States and its allies. The U.S. emerged as a major world power after World War II, particularly due to its economic strength and political influence. By the late 1940s and into the 1950s, the U.S. was firmly established as a First World country, characterized by a high standard of living, advanced industrialization, and significant global influence.