How did fear contribute to the tratment of immigrants?

The available evidence suggests that immigration leads to more innovation, a better educated workforce, greater occupational specialization, better matching of skills with jobs, and higher overall economic productivity. Immigration also has a net positive effect on combined federal, state, and local budgets.

Explanation:

hello there, can you add the "following" multiple choices

collect the tariff by force if necessary

use the military to enforce a federal law

b and c