What are the assumptions and factors that seem most important in shaping immigration policy at different times in US history, and how accurately have they reflected US national interests from your perspective? National interests would presumably include both which immigrants are most desirable at a given time, as well as a desire to avoid the negative consequences associated with some immigrants.

While you should certainly mention specific immigration policies as a way to discuss assumptions, factors, and interests, you are not expected to comprehensively cover all US immigration policies. Also, since you have a chance in question 2 to discuss Presidents Obama and Trump, they should not be part of this answer.