Anthropology is the study of all aspects of humans. Archaeology is the study of artifacts left behind by humans
They wanted the areas that produced more gold.
Immigration was certainly a key factor in the growth of America's economy . The Industrial Revolution came with massive technological developments, and the chance to exponentially improve the production rate of factories. However, to operate these emerging industries it would take a tremendous amount of laborers. American citizens working alone, weren't going to be enough. In other words, the peak of immigration influx allowed the U.S. to take full advantage of the possibility at the right time.
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Both factory workers and slaves had to work long hours, and working conditions weren’t as sanitary as they are today.