Ignoring the obvious question of "how the hell does Mao transport 10 million people across the world's largest ocean before the US government can realise Kissingers blunder and put a stop to their armada", this is probably a good way to start a dystopia.
10 million women, many likely taken from their spouses/children/families, speaking a completely different language with an entirely different culture (and political leaning, though to be honest I doubt many would he diehard Maoists after their betrayal) are thrust into a foreign land that definitely isn't going to welcome them with open arms.
Short term; Chinese ghettos spring up all along the Pacific coast, with infrastructure completely unprepared to handle them. Many starve, crime runs rampant as people take advantage of the carnage and upheaval.
Medium term; Once things stabilise and people manage to find some way of existing in this new reality, the refugees begin migrating east across the rest of the US (Canada also likely sees a large influx). While sticking to major cities, pretty much every county in the Union sees their Chinese population grow by several orders of magnitude. Racism becomes commonplace and accepted, people bash the government for seemingly "allowing an Oriental invasion". Serial killers and other criminals prey on the new demographic with no money to their name nor anyone to miss them, the police uncaring of their disappearance if they ever even hear of it.
Long term; Things eventually settle into something resembling what it was before. Many Americans (particularly the wealthy, though far from exclusively) take Chinese mistresses, the gender imbalance between the US born Chinese being far too great for them to stay with their own as would likely be preferred. Prostitution becomes stereotyped as an Asian profession, being the only way many can make money without anything of their own besides their bodies. Race relations between the other groups is a toss up, either coming closer together to combat 'the new threat', or grinding even harder against one another, another group simply thrown in to stir the pot faster.
Epilogue; Thank God this didn't happen, for everyone's sake
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