The most important power of the legislative branch would have to be that is is made up of two houses that elect the leaders and make laws.
It's made up of two houses of congress they are 100 Senate members and 435 house of representatives.
Obama's main power to make laws has happened 75 times since the time he was elected to the time he ended his term. Some examples are Illegally armed Mexican drug cartels and ISIS militant, Attempting to shut down gun stores outside of law, and Spent tax dollars to re-settle illegals inside U.S.
I believe that the legislative branch is the most powerful because
This branch is the most powerful because these senates and house representatives are elected by the people. And these people who are elected either make the laws or don't allow them to happen, they make the the final decision. Also, the Legislative Branch writes the laws, discusses them, and vote on them. The president and vice president impact the Branch by suggesting things. Last, the branch has a process and introduction to the bill of congress.