Answer:
The entry of the United States into World War II caused vast changes in virtually every aspect of American life. Millions of men and women entered military service and saw parts of the world they would likely never have seen otherwise. The labor demands of war industries caused millions more Americans to move--largely to the Atlantic, Pacific, and Gulf coasts where most defense plants located. When World War II ended, the United States was in better economic condition than any other country in the world. Even the 300,000 combat deaths suffered by Americans paled in comparison to any other major belligerent.
Many people were mining for gold, silver, and oil during the 1800s to gain wealth and fame. So there were definitely many miners during the 1800s. Many people needed to put their valuables in banks. So there were also a lot of bankers, doctors, lawyers, ministers, and many other "White Collar" jobs.
to keep enemys and predators
Answer:
Negligible most of the time, or being able to flip a major party's success at best.
Explanation:
The United States is known to be using a mostly 2 party system ever since the nation was created. The current two major parties are the Republican Party and the Democratic Party, and currently are the only two that actually win presidential elections. At best, the the largest third party (Independents) have seats within Congress, but never have they actually have a representative elected as president.
However, note what I stated at the end of the answer. Third party representatives within the US government is essential to be won over especially when trying to pass controversial party-aligned bills that may not garner support from the opposition. In cases like these, the major parties would try to appease the third parties in order to flip the majority vote to their side. In this case, they play an important role in influencing the US politics, but in any other cases, they are merely representative at best.
~
