It's the infiltration of our educational system and funding of this and online and Main Stream Media efforts and Hollywood efforts that has driven this, not economic differential.
There has always been economic differential, but there is the chance for upward mobility that is the very driver for people flooding our country.
Removing that opportunity is antithetical to the very goal of the migration.
You don't see Americans fleeing to communist countries (not trying to hide like Snowden), now do you?

The push has also been boosted by voter fraud.