American hostility to Germany did not end with the armistice in 1918. The government and the American Red Cross provided massive amount of aid to alleviate hunger and suffering in allied nations after the war, but would not tolerate help to the enemy. Read more
Today, this is just an expression. But in Elizabethan England, it was literally true. In the Summer 2019 issue of Renaissance Quarterly, Mark Rankin, Professor of English at James Madison University, explains.