What is the most powerful branch of the US Government? I believe it's the Legislative Branch. In a walk. The founders clearly intended this to be so, and in spite of an increase in the balance over the years I think it's still clearly more powerful. The reason I ask is that so much of what goes on in government is the responsibility of the Legislative Branch. And they should get the credit or blame. But not only do people fail to understand which branch does what, they don't even know which branch is strongest.