The United States took an active role in promoting some countries for a United Nations Security Council seat as part of its struggle with the Soviet Union during the early Cold War. Did these US-backed countries act in the interests of their promoter when they voted in the Council? Were these efforts of the United States advantageous? By studying the voting behavior of the US-backed countries between 1946 and 1965, this article answers the question of whether promoting some states to international institutions is beneficial for the great powers.