I think you mean "where" not "why". From the 3rd Article of the Constitution. The Constitution only establishes the U.S. Supreme Court, but it gives the Congress the power to establish lessor federal courts. TheJudiciary Act of 1789 setup the lessor courts and has been amended many times since 1789.
hmmm sounds like you didn't do your gov't hw
lolololololololololololololol
Congress has the power to create new federal courts.
Congress
Constitutional Courts - mandated by the constitution Legislative Courts
They created it in 2010
Congress has the power to create lower federal courts, therefore the Legislative branch has the power to create these courts.
Congress is vested with the authority to create courts "inferior" to the US Supreme Court in both Article I and Article III of the US Constitution.
The Constitution gives Congress the judicial powers to create all of the federal courts below the Supreme Court and to structure the federal judiciary. Congress also has the power to define federal crimes and set punishment for violators of federal law.
They have the power to create new federal courts.
Congress has the power to create new federal courts
Constitutional Checks and Balances.
Constitutional Checks and Balances.
blah blah blah