What restrictions?
Migration from Mexico to the USA is down to a net of zero for the 1st time in 60 years, according to the Mexican Migration Project at Princeton. People caught trying to cross the border are down 54% from 2008, at the lowest level in almost 40 years. Predictable since the Border Patrol has nearly twice as many people on the US-Mexico border & they're using military type technology. And not all illegal migrant workers are victims of human trafficking. If they want to be in the USA & they're not stuck paying off a debt to a coyote, they're not a victim.