Final answer:
During World War II, the U.S. faced setbacks in the Pacific while also gaining advantages such as breaking the Japanese naval code during the Battle of Midway.
Step-by-step explanation:
During World War II, all of the given options are true. Some of the early battles did take place in the Pacific, such as the Battle of Midway. During this battle, the U.S. broke the Japanese naval code, which gave them a significant advantage. However, the U.S. also had several early setbacks in the Pacific, especially during the early stages of the war.
Learn more about World War II in the Pacific