Why do western countries have more divorce?

I been doing research on divorce rate by percentage by decades and by countries. If finance is reason people divorce in the west. Then why do countries in 3rd world have made success in marriage and staying married long term. While western countries have higher rate of divorce. In 60s n 50s Westerns had more morals and values and had better marriage outcome.
Why do western countries have more divorce?
Why do western countries have more divorce?
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