In the United States, marine transportation is responsible for $361 billion, or 1.7% of the U.S. Gross Domestic Product (GDP). Marine transportation, a key part of global logistics and responsible for 40% of international trade, goods and services, is the backbone of U.S. trade. In the U.S. in 2021 alone, ships have transported more than 1.5 billion tons of cargo valued at more than $1.