What caused to make the legislation branch

Quick and choppy summary:

The legislative branch was made due to the fact that the U.S. needed laws and needed people to write, debate, and pass laws and/or bills. It was also created to prevent the abuse of power in the government.

Explanation:

At the Constitutional Convention in 1787, the framers of the U.S. Constitution sought to build the foundations of a strong central government. But they also wanted to preserve the liberty of individual citizens, and ensure the government didn’t abuse its power.  To strike this balance, they divided power between three separate branches of government: the legislative, the executive and the judicial.

The legislative branch is the part of the United States government that creates laws. Whenever you read about congresspeople in the Senate or House debating a law, you're reading about the legislative branch: the branch of the government that writes, debates, and passes laws. Making laws can be called legislating.

The executive branch consists of the President, his or her advisors and various departments and agencies. This branch is responsible for enforcing the laws of the land. The following are executive branch organizations and agencies

The judicial branch includes criminal and civil courts and helps interpret the United States Constitution. The most important part of the judicial branch is the Supreme Court. The Supreme Court's role is to interpret the Constitution and limit the powers of the other branches of government.

I hope this helped you in any way!

could you go a bit more in depth with you question? it's quite hard to understand. as soon as you do that i will be glad to : )