Provide me some details about United States attorneys with the given text as a reference. 
 1. In each of the 94 federal court districts in the United States, United States attorneys are representatives of the U.S. Department of Justice who act as the top federal law enforcement officials.
2. Each U.S. attorney represents the U.S. federal government in civil action in federal and state court within their geographic jurisdiction and acts as the country's top federal criminal prosecutor in their judicial district.
3. U.S. attorneys serve four-year terms after being appointed by the President and being confirmed by the Senate.