What are the main differences between the eastern and western marriage systems?

There are great differences between Chinese and western cultures, people's cognitive concepts, marriage concepts and marriage systems.

China's preference for boys has been handed down from ancient times. Only women in China need to be loyal to a man from beginning to end, otherwise they will be cast aside by society. In the west, whether in the dark middle ages or in modern times, men and women are more equal, and both men and women should be loyal to one person. This is easy to see from the emperors of Louis. Also, the medieval Roman marriage law made bigamy a crime, but China didn't? The Marriage Law was promulgated in 1950, and Rome was more than 1000 years earlier than us. Therefore, at this point of marriage, the west does do better than us.