Great Britain, France, Australia, and New Zealand declare war on Germany. President orders a Neutrality Patrol by Navy to report and track any belligerent air, surface, or underwater naval forces approaching Atlantic coasts of the United States or the West Indies. Allies announce a long-range blockade of Germany. Canada declares war on Germany. Germany announces counter-blockade of Allies.
Russian forces invade Poland.
President asks for repeal of arms embargo provisions of Neutrality Act of 1937. Poland is partitioned by Germany and Russia. Act of Panama is approved by Conference of Foreign Ministers of American Republics meeting in Panama City. A neutrality zone some 300 miles in breadth is to be patrolled by the United States Navy. Germany notifies the United States that merchant vessels must submit to visit and search.