The Germans' continued attacks on U.S. merchant vessels
There were various factors prompted Stalin's actions. For example, the events of the Second World War were very influential on him.
the bombing of pearl harborthe bombing of pearl harbor!
Germany sank many American merchant ships around the British Isles which prompted the American entry into the war.
by Gerrnan submarine
by Gerrnan submarine
Japan's surprise attack on Pearl Harbor naval base in Hawaii. Germany and Italy shortly also declared war on America.
The Sinking of the Lusitania and the Zimmerman telegram.
Japan attack on Pearl Harbor
Germany attempting to form a military alliance with Mexico
north Vietnam invaded south vietnma
Two big events in other countries that prompted people to move to US in the late 19th and early 20th century was war and poverty.
Embargo Act of 1807 War of 1812