Because most American women we date are terrible. Feminism has creeped into the culture so much even conservative women are influenced by pop culture destruction of marital roles.
A few books for reading:
THE MYTH OF MALE POWER
THE MANIPULATED MAN
THE WAR ON BOYS
Watch the documentaries:
RED PILL (about the Men’s movement)
and
DIVORCE INC (about the terrible man hating U.S. legal system)
It’s a global economy. Foreign women >>> American women.
I would add “The Rational Male: Preventative Medicine” as a book to acquire, as well as “No More Mr Nice Guy” - title is misleading, it is basically how being a beta male (nice guy) is a guarantee you are not going to do well with women.