May 20, 2017· Maritime Trade and Transportation by the Numbers. By Matthew Chambers and Mindy Liu. PDF. The nation will observe Maritime Day on May 22, which was designated by Congress in 1933 to honor U.S. merchant mariners and the maritime industry. 1 Water transportation contributed $36 billion U.S. dollars and 64 thousand jobs to the U.S. economy in 2010, which helped keep Americans …
