Many of them do. Canada and India both have some excellent educational instutions. Yet there's often far more lucrative opportunities for an ambitious 20-someth

Many of them do. Canada and India both have some excellent educational instutions. Yet there's often far more lucrative opportunities for an ambitious 20-something in the US than they can easily find in the location they may happen to already be in. Leveling up is a long, slow process of decades. Immigration offers to improve someone's life a lot faster.