Final answer:
Japan's dilemma with the United States was centered around their expansionist plans and the US's sanctions. Japan decided to launch a surprise attack on Pearl Harbor.
Step-by-step explanation:
The dilemma Japan had with the United States revolved around their expansionist plans in the East and the United States' imposition of sanctions, including an oil embargo, to pressure Japan to cease their aggression. Japan saw the United States as a soft enemy and believed that a surprise assault on Pearl Harbor was necessary before the United States could enter the war. The decision was made to launch the attack on December 7, 1941.
Thus, Japan faced a diplomatic and economic dilemma with the United States, particularly during the early 20th century. Struggling with economic challenges, Japan sought resources in Asia, leading to conflicts with U.S. interests. Tensions escalated, culminating in the attack on Pearl Harbor in 1941 and Japan's entry into World War II.