Good to know. Not sure if this is a question or not.
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.
This answer is true , millions of Africans continue this tradition even til this day.
In order to avoid problems with the Native Americans, the federal governments decided to gradually assimilate the native population into the American society.
There were multiple actions taken to accomplish the assimilation.
The Native Americans were granted all the rights as the other people, which enabled them to constantly communicate with everyone else, to get familiar with the culture, and get exposed to the culture, eventually accepting it.
Also, all the Native American children were obliged to visit school and get educated. The education was on English language, and the children were mixing from early age with children of the other ethnic groups, thus becoming Americanized from very early age.
They were allowed and motivated to work in the places were everyone else was working, which led to further assimilation, as the majority of the people were not Native Americans, so in order to fit in they had to merge into their culture.
After the civil war there was a huge surge to rebuild the infrastructure of the U.S. many Americans wanted to move west to escape the horrors of the civil war, which started the race to the west coast (intercontinental railroad)
