The West has mostly leaned towards individualism (aka “it's a free country”) while the East Asia under the influence of Confucianism is most collective.
Things have changed over the decades. Those countries have become more individualistic and divorce is less taboo among the current generation than the Boomers.
Mainland China has a surprisingly high divorce rate.
How do you explain why Canada has a divorce rate less than one half of the United States?
Japan and the Netherlands have roughly the same divorce rates, and wildly different cultures.