Why does marriage work within some cultures but not others?

If you take a look at some cultures such as jewish people: many of them marry at a very young age. Then they have a lot of children and they end up staying married for the rest of their lives. In American culture, people who marry at a very young age tend to get divorced as they approach middle age. In the 1920s, people married their neighbors and they stayed married for the rest of their lives. Its unlike modern americans where they date 10 people before they found "the one" but only to divorce 15 years later , stating that they can't get along any more.

Where lies the problem? Is marriage a concept that simply does not work or is it that some people are unfit for marriage?

Why does marriage work within some cultures but not others?
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