A more thorough explanation:

The Jones Act, also known as the Merchant Marine Act of 1920, is a law that supports the development and maintenance of a merchant marine in the United States. This law requires that shipping between U.S. ports must be done by ships that are registered in the United States.

For example, if a company wants to transport goods from New York to Los Angeles, they must use a ship that is registered in the United States. They cannot use a ship that is registered in another country.

The Jones Act also gives seamen the right to sue their employers if they are injured while working at sea. This means that if a seaman is hurt while working on a ship, they can take legal action against their employer to get compensation for their injuries.

For example, if a seaman falls and injures their back while working on a ship, they can sue their employer for compensation. The Jones Act gives them the right to do this.

The Jones Act is important because it helps to support the U.S. economy by ensuring that shipping between U.S. ports is done by U.S. ships. It also protects seamen by giving them the right to sue their employers if they are injured while working at sea.