What happened in China in the period between Han and the Sui dynasties?
between the Han and the Sui the country was split into smaller regions and kingdoms, which were in a state of conflict. This time was known as the "Period of Disunity"- there was no one China, but many smaller places.
At the time that the Han dynasty fell, which was around 220, China began in a extensive period of rivalry, invasion and warfare with other nations. After that, there was a period called the "Period of Disunity", which ended around 589 where the Sui dynasty began.