Okay! So, Shays' Rebellion happened a long time ago in 1786. One reason why it happened is that many farmers in Massachusetts were really upset because they were having a hard time paying their taxes. They didn't have enough money because they were struggling to sell their crops and make a living. This made them mad because they felt the government was not helping them.
Because of Shays' Rebellion, which was when these farmers protested and even took over some places, more people started to talk about how the government needed to be better. One important effect was that it helped the leaders realize that the Articles of Confederation, which was like the rules for the country, weren't working well. This led to people eventually creating a new plan for the government called the Constitution. So, the rebellion helped change things for the better!