The powers of the congress building is they can do what they want they have the power to pass or fail a bill.
The branch is made up of republican and democratic party.
The government constantly uses this branch because they have the powers for the laws that need to be passed and bills as well.
I believe this branch is the most powerful because not only can they pass laws and bills they can impeach the president. No one else can do that and have as much as say as they do in the government. They can go against what the president says if they dont like it or dont think its right.