what caused the historical inciden referredt o as "shay's rebellion"?why was it a sign of the times?

High taxes, bankrupt farmers, and threat of debtors' prison were causes of Shay's Rebellion. It showed the necessity of a Constitution that provided fair and equal justice to everyone. Check this site for more information.

http://encarta.msn.com/encyclopedia_761552054/shays%E2%80%99_rebellion.html