Dang, Mao was really enthusiastic about that "10 million Chinese women to America" plan. I thought it was just an off-hand joke, but if you read the transcript, he brought it up like five times.
Responding to the OP, such policies are basically unthinkable in the West, but this scenario could be possible for Middle Eastern or East Asian countries. ME countries have a religious allowance for polygamy so while IOTL it's sort of uncommon, historical divergences could result in some of these countries specifically opening up a visa category for marriageable women to increase the population. As for East Asia, I can see something like this happening in the future where in an effort to correct their >1.0 TFR, places like Taiwan and South Korea incentivize female immigration in hopes they will marry local men and have children. China could also try this, targeting its poorer neighbors and maybe even offering cash or other incentives.