How have the US`s immigration laws changed in the past few years/decades?

This constitutes the thesis statement of your paper. Your submission needs to be strong enough to support a 18 page paper minimum. Answering the following questions will help ensure that you have a strong thesis statement:
1. Is the thesis specific?2. Is the thesis clear?3. Does the thesis illustrate the position you intend to defend in your paper?4. Is the thesis original?
https://owl.purdue.edu/owl/general_writing/the_writing_process/thesis_statement_tips.html