First American warship - sunk in the Atlantic, I believe. Oct 31, 1941.
USS Panay - sunk on the Yangtze River in China - Dec 12, 1937
Merchant Marine - different story....
If your source is accurate, to an equivalent date of February 1941 only 2 US vessels have been sunk
one by a mine in the Pacific and one by torpedo from a U boat in the South Atlantic
Total deaths - 3