It has worked like a charm, accelerated by Democrat acts to increase their political support by "replacing" more White voters with hordes of illegal aliens who automatically become Democrat voters. They learned a powerful lesson from LBJ's Great Society which has kept Blacks on the Democrat Plantation for 50-plus years now.
Don't be surprised if Biden follows through on his intention to bring many Palestinian "refugees" to the U.S. for the same reason.
Importing more Pals to America, guess what, Jews have pimped that for a while: