History has shown how this protectionism will work out eventually:
The Merchant Marine Act of 1920 is a United States federal statute that provides for the promotion and maintenance of the American merchant marine ... It requires that all goods transported by water between U.S. ports be carried on ships that have been constructed in the United States and that fly the U.S. flag, are owned by U.S. citizens, and are crewed by U.S. citizens and U.S. permanent residents. ...
The Merchant Marine Act of 1920 has been revised a number of times; the most recent revision in 2006 included recodification in the U.S. Code.
and the end results:
In 2024, China captured over 53 percent of global market share in the commercial shipbuilding industry, while the United States accounted for only 0.1 percent. Just one Chinese firm, the state-owned juggernaut China State Shipbuilding Corporation (CSSC), built more commercial vessels by tonnage in 2024 than the entire U.S. shipbuilding industry has built since the end of World War II. [Japan and South Korea takes up 43% of global market share.]
Of course, US politicians never care about history. They will only drum up accusations (e.g. protectionism, government subsidies, etc.) against US rivals, even though the US itself has practiced such policies for long long time.