The United States and the Soviet Union establish formal diplomatic relations.

The Union of Soviet Socialist Republics (USSR), commonly known as the Soviet Union, was a transcontinental country that spanned much of Eurasia from 1922 until it dissolved in 1991. During its existence, it was the largest country by area, extending across eleven time zones and sharing borders with twelve countries, and the third-most populous country. An overall successor to the Russian Empire, it was nominally organized as a federal union of national republics, the largest and most populous of which was the Russian SFSR. In practice, its government and economy were highly centralized. As a one-party state governed by the Communist Party of the Soviet Union (CPSU), it was the flagship communist state. Its capital and largest city was Moscow.

Relations between the Soviet Union and the United States were fully established in 1933 as the succeeding bilateral ties to those between the Russian Empire and the United States, which lasted from 1809 until 1917; they were also the predecessor to the current bilateral ties between the Russian Federation and the United States that began in 1992 after the end of the Cold War.