What could we do with $38,000,000,000?

Fix some bridges, maybe?  Repair some of our infrastructure?  Anything other than letting illegal aliens dump it into their countries?

Perhaps comically, remittances were actually Mexico’s biggest source of foreign income after auto exports, far surpassing the $20 billion that Mexico earned from oil exports and the $19 billion from tourism in 2017. 

Undoubtedly the majority of these remittances were sent by legal immigrants to America, although a substantial share was in fact sent by illegal immigrants.  It is estimated that illegal immigrants sent $38 billion abroad in remittances in 2017.

A country that refuses to enforce it's borders stops being a country in short order.