The Constitution works because everything is fair. You can’t make a decision without a proper agreement from the majority. we all need each other.
That’s what checks and balances means. Basically, the constitution works because of the checks and balances system. The three branches of government all have their own role, but due to checks and balances, no action is completed, unless everyone agrees, unlike most other countries, where what the leader says, goes.

The Legislative Branch is a very important section of the government. It creates laws and passes them onto the Executive Branch for conformation. The Legislative Branch also has the power to Check the other branches and Balance the powers of the other branches of government. For example, if the Executive Branch veto's a bill, Congress can get a two-third vote and overrule the veto.

The Executive branch is responsible for enforcing the laws passed by congress. Congress passes a law, which gets proposed by the legislative branch. The executive branch, headed by the president, enacts regulations to implement the law, and makes sure that the law works. Everyone depends on each other.

The Judicial Branch is where laws are passed or vetoed. There are smaller courts to handle the less important problems, and bigger ones to handle the big problems. The largest court and most powerful court is the Supreme Court. It has 9 justices and all of the justices are appointed by the president.

Basically, everyone needs each other, using checks and balances.
No law is passed, without a majority vote.
No war is started, if not everyone agrees.
Nothing happens, unless all three branches are, in their own way, in favor of it.