The United States entered The Vietnam War to stop the Spread of Communism in Indochina
The decision of the United States to enter world war two was the Japanese bombing of Pearl Harbor on December 7, 1941.
the bombing of Pearl Harbor
Japanese attack on Pearl Harbor in 1941.
sinking of lusitania
Japan attack on Pearl Harbor
Two of them might be the Zimmerman telegram and the sinking of the Lusitania
There are two primary causes for the US entering World War I. First and foremost is the sinking of the Lustitania and Unrestricted Submarine Warfare. The concept of Unrestricted Submarine Warface (USW) was that any ship, flying anyflag, neutral country or not, around the coast of the United Kingdom would be treated as a warship, and promptly attacked. When the Lusitania was sunk in 1914: roughly 120 American civilians were killed. Afterwords, Germany suspended USW until 1917. In 1917 Germany resumed USW, after repeated warnings from the US that it would mean War.The second reason is the Zimmerman Telegram, sent to Mexico on Germany's behalf. It promised German support if Mexico would open a domestic front and invade the US, should it come to war. Naturally, the citizenry was outraged.
Yes, they definitely need a passport to legally enter the United States.
As long as you are from the United States citizen, You can enter it. We are a United States territory