Of the couples I know in which both partners are still smiling 20+ years after getting married, many or most are American male + foreign female. Considering the low percentage of such marriages, I find that extraordinary.
A man who is considering marriage to anyone should understand that his real long-term marriage partner may turn out to be the family court judge who will rule his life after the divorce.
Nailed it. My husband's ex shrew divorced him shortly after the third child was born... he's 49 and has been paying hefty matriarchy support for 12 1/5 years. Will be impoverished for another 6 1/5 years yet. Matriarchy support goes well beyond 18 years here in NY. Funny thing is she's college educated and he's blue collar. While they were married, he worked 2 and 3 jobs while she was a stay in bed mom. literally. After the divorce and a pile dream failed business, she got a govt job and re-married a white collar beta male.