Final answer:
The excerpt supports the idea of Mexicans being blamed for taking American jobs during the economic decline. The statement that best supports this is "now Americans argued that Mexicans were taking American jobs.".
Step-by-step explanation:
The excerpt provided supports the idea that Mexicans were blamed for taking American jobs during the decline of the U.S. economy in the 1930s. The statement that best supports this idea is:
"now Americans argued that Mexicans were taking American jobs."
This statement highlights the perception and prejudice against Mexicans during this time period, as they were seen as competition for jobs amidst the economic crisis. This sentiment led to discrimination and scapegoating of Mexican immigrants and even U.S. citizens of Mexican descent.
Learn more about Mexican immigration and job competition