Why do you think the federal judiciary act created both state and federal courts

The Federal Judiciary of the United States was established with the creation  of the Judiciary Act of 1789. The Act announced the United States judicial power should fall on the Supreme Court, and at the same time in lower courts in which Congress had the power to create as they thought convenient.

The Judiciary Act in itself did not see to mandate any specific arraignments on how these courts should be formed or conducted, neither how their procedures should be directed. The Act left all that responsibility to be determined by Congress.

The Congress in its new capacity, decided to begin a system of federal trial courts which had greater jurisdiction and could function as an enforcement tool of national laws for each individual state. This in term, became the main purpose for the establishment of the Judiciary Act of 1789.  

this is a good question! i'll do some research and come back when i have the answer!