And you believe reducing migration will increase jobs? Reducing our population would decrease both supply and demand. This means that the ability of American labor to specialize would be hindered and increase the real costs of goods and services. Decreased demand obviously means that less goods and services would be demanded to begin with.
Read the literature of the economics of immigration before you go any further. I recommend David Card. He is one of the leading authorities on this issue. Obviously do a proper literature review if you have the time and resources.
http://davidcard.berkeley.edu/papers.html
I do repeat my question though, are you a libertarian? Because you've just lost a few more brownie points by implying you have a right to a job. If you can't find work go back to school and learn new skills. You don't need to get a new BA degree or anything like that. There are plenty of skill shortages in LA that could be met by taking a few courses as a technical school. Attacking others, especially those who don't have the ability to defend themselves such as migrants, won't help though. Channel your energy into improving yourself instead.