The “Monroe doctrine” was a foreign policy initiative by President James Monroe of United States in 1823. Since then, for a century, US’s foreign policy more or less followed the path set by the Monroe doctrine.
What were reasons the United States entered World War I?
1. Unrestricted submarine warfare:
- sinking of the ship Lusitania (1915) in which many passengers died
- The “Sussex” pledge (1916)-a promise made by Germany to not harm US’s ships but it was broken in 1917
- Germany renews unrestricted U Boat attacks (1917)