Why did some established mexican americans respond to the growing number of new arrivals with calls for immigration quotas in the late 1910s and 1920s?

Well, they actually feared that more recent arrivals would drive down the wages and also incite white prejudice against all the ethnic Mexicans in the late 1910s and 1920s.

Hope this helps.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

i beleive that it was john rolfe