Thank You for the source. The source you quoted is historian Carlisle. I knew about U-46 but could not find the German language source. But Carlisle shows his German source at Table No. 1 Der Handelskrieg mit U-Booten.
Here is footnote 64 for the thread readers:
64.The total would be six if only the Vigilancia were considered; it would be thirteen if the
losses on board the Healdton (sunk by a mine, but assumed at the time to be sunk by a
German submarine) were included. Since the news of loss of the Aztec did not arrive until
Wilson was delivering his address, it was not part of his case as he made it.
The New York Times printed on April 2nd the news about both Wilson's speech and the AZTEC sinking from the previous day. I agree, news was much slower back then! Again, thanks for the source
