Okay kiddo, so you know how sometimes people work together to do things, like cleaning up a big mess or building a really tall tower? That's kind of like what the Powers of the Union are – it's when different groups in a country (like the government or the people) work together to make decisions and get things done.
In Mexico, there are three main groups that are part of the Powers of the Union: the Executive (which is the President and their helpers), the Legislative (which is a group of people who make laws), and the Judicial (which is a group of people who make sure everyone follows the laws and punishes people who break them).
These groups work together to make sure Mexico is running smoothly and everyone is following the rules. The Executive makes decisions and carries out plans, the Legislative creates laws and makes changes to them if needed, and the Judicial makes sure everyone is following the laws and gets punished if they aren't.
It's important for these groups to work together and communicate with each other so they can make good decisions and make Mexico a better place for everyone who lives there.