How can the sociological perspective theories can be applied to the plight of the “undocumented worker” that comes from Mexico and other Latin American countries to the United States?

Question: How can  the sociological perspective theories can be applied to the plight of the “undocumented worker” that comes from Mexico and other Latin American countries to the United States?

Use documentary “9500 Liberty” as example,
https://vimeo.com/128386646

3 paragraphs (intro, body, and conclusion)