Why is the divorce rate so high in this generation verses the previous one in places like China?

When my parents were in their 20s only 1 in every 5000 people in their social circle was divorced and my dad says that in our generation, in China, 40% of people get divorced. In the United States the divorce rate is even higher. How did the divorce rate go from 0.02% to 40% in under 50 years?

Why is the divorce rate so high in this generation verses the previous one in places like China?
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