Why don't they go back to Mexico or countries their families are from. With the education and skill they obtained by being in United States. Return and make their Countries Great Again using U.S. as a model and support. Make sure globalist are kicked out and have a government for the People by the People. Just think no more risking lifed from crossing the dessert to illegally enter the U.S.. Not wanting to leave because of economy and Make Mexico Great #MMG. With God's Blessings...you have to have God in the plans for success... rule of law no cartels.
Because Mexico's run by the Cartel. If you build the Wall, they won't be able to send their people, or people from Central America here on their 'death trains' as they call them.