The Whaling Industry allowed for Americans to dissolve isolation of Asian countries. The Treaty of Guadalupe Hidalgo added ports along the Pacific that wereused for U.S. influence and explorations. Opium was also a major driving factor ofinterest through trade, in addition to the idea of expansion with the Kanagawa Treaty,which opened ports to American commerce. The United States wanted to extend theirborders to keep close contact for American success.
They were poor so the went into debt
On December 8, 1941, one day after the attack on Pearl Harbor, the United States declared war on Japan. This prompted Germany to declare war on the United States, which, in turn, led to the United States to declare war on Germany on December 11, 1941.
The two possible outcomes are:
1. The boomtown losses it's economic power, and people migrate away from it to other places that they consider better for living, and thus leaving it as a ghost town.
2. After the main income of the boomtown is lost, people put their efforts into other things that can make them survive and keep the town alive, maybe a timber industry, fishing, agriculture, tourism.