Problem
Is this case is "does immigration status influence variation in the economy in the U.S among American studies" we are using the Unites States as a reference and all states (50), undocumented, legal and naturalized citizens and foreign born.
Qualitative Analysis
1. Provide a qualitative discussion of at least two carefully selected case studies. If your quantitative dataset measures a population other than individuals (states, countries, cities, etc.), select two high-impact cases and performs primary or secondary source process-tracing research on the properties of those cases.
2. If your quantitative dataset consists of surveyed individuals, choose two people that could have been selected for the survey to interview.