The U.S. actually has a very lenient immigration system, at least compared to other high income nations. Easier to become a citizen here than most other places as well. We are an outlier in the way that we put more emphasis on family members being able to immigrate here, rather than employment/education/skills-based migration.

Pretty sure we’re one of (if not the only) high income countries that still has birthright citizenship. Most everywhere else one or both of your parents needs to be a citizen when a child is born, for that child to be given automatic citizenship.