A more thorough explanation:

The United States Customs Court was a court that used to handle cases related to customs and duties. It was abolished in 1980, and its responsibilities were taken over by the United States Court of International Trade.

The United States Customs Service, on the other hand, is an agency within the U.S. Department of Homeland Security that is responsible for collecting import duties on goods, wares, and merchandise, as well as enforcing customs and related laws. It was created in 1863 and was transferred from the Department of the Treasury in 2003. It is also known as the Bureau of Customs.

For example, if a company imports goods into the United States, they would have to pay import duties to the United States Customs Service. If they fail to do so, the agency would enforce customs laws and impose penalties.

The United States District Attorney is also known as the United States Attorney. They are responsible for prosecuting criminal cases brought by the federal government. They represent the United States in legal matters and defend the government's interests.

For example, if a person is charged with a federal crime, the United States District Attorney would be responsible for prosecuting the case in court.

The United States District Court is a federal trial court that has jurisdiction within its judicial district. It is abbreviated as U.S.D.C.

For example, if a person wants to file a lawsuit against someone in a federal court, they would file it in the United States District Court that has jurisdiction over the area where the defendant lives or where the incident occurred.