Why was the united states an attractive place for immigrants to come during the early 20th century? what factors pulled them from their native countries to the us? what is the major difference between “old immigrants” and “new immigrants? ” give examples to display the difference. (btw, this has three questions but four parts)

1)The United States was an Attractove Place for Immigrants to come during the early 20th Century because the Immigrants had substantial lower-paying jobs.

2)The Factors that pulled them from their Native Countries to the US is:
Better Housing, More Paying Jobs.

3)The immigrants who reached the US during the Early 1800s were known as old immigrants. Others who reached the US during the Late 1800s were known as New Immigrants. The Difference is the type of people that immigrated. Another Difference is the reasons why they paved the way for Immigration. Old immigrants generally came from Northern and Central Europe, Especially England and its territories. 
Example: A Poor Person will go to the US for a High-paying job.

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Idon’t know the answer sorry