Which eventually led to war when the embargo against this country was dropped by the US?

The embargo in question likely refers to the United States' trade restrictions against Japan before World War II. When the U.S. lifted the embargo on oil and other essential supplies in 1941, it exacerbated existing tensions between the two nations. Japan, reliant on these resources, sought to secure its interests in Southeast Asia, leading to the attack on Pearl Harbor and the subsequent declaration of war. This marked the entry of the U.S. into World War II.