The article is devoted to the study of various aspects of daily life of the US Embassy in Czechoslovakia in 1945—1948. The author considers the main areas of its work, major problems and difficulties that American diplomats had to overcome being in difficult conditions of the post-war economic recovery and international tension growth. Special attention is paid to the role of Ambassador L. A. Steinhardt, his methods of leadership, interactions with subordinates, with the Czechoslovak authorities and the State Department. This allows to reveal some new aspects of American diplomacy functioning, as well as to identify poorly explored factors that influenced American politics in Central Europe during the years when the Cold War was brewing and tensions between Moscow and Washington were rising. The article is based on unpublished primary sources from the American archives.