Final answer:
Mexican immigration to the US has declined in the past decade due to stricter immigration policies and improved economic conditions in Mexico influenced by NAFTA.
Step-by-step explanation:
The decline in Mexican immigration to the US in the past decade can be attributed to a combination of factors.
One of the main reasons is stricter immigration policies, which make it more difficult for Mexicans to enter the US.
Additionally, improved economic conditions in Mexico, partly influenced by the North American Free Trade Agreement (NAFTA), have reduced the need for Mexicans to migrate.
NAFTA contributed to increased job opportunities in Mexico, which has led to decreased immigration to the US.