The mass migration has been going since before 1986, when Republicans gave amnesty to illegal immigrants, on the promise of getting better border control [1]. They didn't get it, nor was legal immigration reduced in any way, nor did the Republican party itself fight too hard for either. No surprise voters felt betrayed. California passed a referendum to stop literally funding illegal immigration, only for it to be judicially overturned [2].

Again and again and again, any kind of limit on immigration, no matter how popular, was rejected. Is it any surprise it came to this?

[1] https://en.wikipedia.org/wiki/Immigration_Reform_and_Control...

[2] https://en.wikipedia.org/wiki/1994_California_Proposition_18...

>There was large scale mass migration into the country that appeared to be facilitated by the last administration.

Did you forget to specify "illegal" migration in regards to this conspiracy theory or did the mask just slip here?