This was a period of both disturbances and developments in Chinese
history, especially during the Three Kingdoms and the two Jin dynasties
when political struggles were acute and civil wars frequent. Ethnic
minorities in the north entered the Central Plains and set up
governments there. The result was a long period of confrontations
between the minority regimes and regimes established by the Han Chinese
in the south. The economy in the south made some progress during this
time and the northern regimes accepted the Han political system and
culture to varying degrees. This marked the beginning of a merger
between the Han and minority cultures. China's contact with foreign
countries also became more pronounced. Buddhist culture of the Western
Regions, in particular, was introduced to China on a large scale,
exerting a far-reaching influence on Chinese culture. Great progress
was made in science and technology, and literature and art reached an
important stage linking the past to the future.