Why would many different groups join together in a “nativist” crusade against peoples of Mexican descent and recent Mexican immigrants in the 1920’s

In the early twentieth century the United States were thriving. The industry was constantly growing and the country was becoming more and more powerful. Mexico, on the other hand, was in an opposite situation, with the country being in big problems with internal unrest, corruption, low development. This resulted in mass migration of Mexican into the United States. This was not seen very fondly by the majority of the Americans, with the main reason being the competition for the jobs.

The Mexican were coming from a poor country were they were not earning much, so they were satisfied with much lesser wages in the United States.
This was a big blow for all the efforts of the labor unions to improve the working conditions and rise the wages, as the Mexicans didn't demanded any of that.
The factory owners understandably started to employ Mexicans as they were able to make more profit.
This resulted in big revolt from the Americans against the Mexicans.

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