Which of the following was NOT a reason given in favor of restricting immigration? 1) Immigrants took American jobs.
2) Immigrants brought undesirable customs to the U. S.
3) Immigrants introduced unwelcome political ideas.
4) Immigrants took too much land away from Western settlers.

The first one since it's just ignorant, anyone can get a job it's only the matter if they know how to do and if they are good at it, if they are pressed about the Raza (Hispanics/ or in this case any race) getting jobs, that's on them.

describe a little more.

a historian researching the immigration policies of the early 1900s would expect a source written today,rather than in 1910 to :

( a ) be more interested in objective data and statistics.