Because Trump started talking in mid 2016 about “America first” and all the expected prosperity to be coming to the USA it’s only NATURAL that more and more immigrants have been coming back here lately.
They all would stupid not to come here after hearing how the USA is going to be THE PLACE TO BE. It adds up to more opportunity and prosperity in the third world nations as they get rid of excess population of people that need jobs. They free up jobs and apartments where they leave.