What causes daniel shays to sell off half of this land after the american revolution

Daniel Shays may have sold off half his land to pay off his debts or his family's debts. 

Massachusetts was Daniel Shays home. In this area, a lot of farmers were in debt and others find it difficult to pay off their debts. Those who were unable to pay their debts were sent into prison, making life more difficult for the farmers and their families.

Daniel Shays was a leader of a revolt against Massachusetts government. They protested the against the high taxes imposed on their lands as well as the forceful seizure of farmlands by the local sheriffs. The rebellion was identified as Shays' Rebellion. 

"teotihuacan was the cultural center of the zapotecs".

Very useful. it is to learn because history repeats itself so learning about it those mistakes not happen again.