Not as in, immigrant friendly. Meaning allowing anyone in who doesn't look like they are carrying a serious communicable disease. They'll take in rich, poor, white, black, whoever. In any numbers so long as they can find a place to stay. Anyone can work there, go to school, stay at a families house, or do whatever indefinitely. POD is 1960.
POD, 1961: Nikta Khrushchev develops Graves Disease, and it is not diagnosed.
Come 1962, during the Cuban Missile Crisis, and under the influence of increased aggression, he orders a Decapitation Strike on the US, which is, against all odds, successful.
The launch codes are lost in the confusion, and operating under the mistaken belief of a Missile Gap, the newly sworn in President capitulates.
Over the next few years a series of "Unequal Treaties" are drafted to limit the danger of the US becoming a threat to the USSR.
The Third One, with the unstated goal of disrupting the Culture and Social Cohesion of the US, is an imposed Open Border Policy under the pretext of allowing the historically exploited Third World Workers a chance to benefit from the nation they "built" with their exploited labor.
Hilarity ensues.