Based upon what you have read has the immigration caused large amounts of unemployment within the united states in the last twenty years

I would say No, but this is arguable

Explanation:

Immigration fills those jobs that people essentially do not want such as a electrician or even janitorial services. I'm unsure what you were reading before this, but the unemployment rates have gone down when immigration is at a high.

a. theta waves. this is because the person is in a light sleep which means the brain waves would show these kind of waves.