The US had planned to stay out of the war at first. They would only send aid to the Allied Powers, but they did not fight. When Germany heard they were sending aid to the Allies, they got angry and bombed one of the supply ships, which really angered the US. Thus, the US joined the war on the Allied side.
Upon entering World War I as a combatant, the United States joined the side of the Triple Alliance (whose major members consisted of Great Britain, France, and Russia) mainly because it had suffered from attacks by German submarines while still maintaining its neutral status. In addition, public sympathy in America had already leaned strongly towards Great Britain (and its allies) due to the similarities in the cultural and political heritage of the two nations.
Economics
Some say the "bankers" were involved.
Politics
Ideology
Zimmerman Telegram
Other points influenced entrance to the war, but the Zimmerman Telegram (sometimes called the "Zimmerman note" or "Zimmerman telegraph") finally pushed the US to war. The Zimmerman Telegram was sent from the German foreign secretary to the German Ambassador to Mexico. It stated the following:
The telegraph was intercepted by British Intelligence and transmitted to the American government by the Brits.
This infuriated Americans. It was the same sort of alliance that plunged Europe into war.
Other WikiAnswers Contributors agree:
Problem regarding the Lusitania as a reason (cause) for American entry
Twenty-two months plus passed between the sinking of the Lusitania in May 1915 and U.S. entry into World War 1 in April 1917. In view of this it is very hard to see the Lusitania as a cause of American entry. It no doubt did much to turn American public opinion against Germany, but that's a different matter. It really seems that the idea that the Lusitania was a cause or the #1 reason is a myth. Is anyone really claiming that the U.S. waited for 22-23 months to respond to the sinking of the Lusitania?
because the germans sinked the Lusitania ship. In the ship they were many americans. and besides the germans were already inform that the ship was coming so they didnt sink it and they still did
because the united states were stupid
In WWI, the USA was part of the Allied Powers, and the Central Powers were a coalition of Germany, Austria-Hungary, and the Ottoman. In the battle betwen the United States and the Central Powers, the United States along with the rest of the Allied Powers won.
United States, United Kingdom and Soviet Union.
The Allied Powers included the United Kingdom (Great Britain), France, Belgium, Serbia, Montenegro, and Russia. The opposition, the Central (Axis) Powers, consisted of Germany and Austria-Hungary. In 1914, Japan joined the Allied Powers
forty
forty
In WWI, the USA was part of the Allied Powers, and the Central Powers were a coalition of Germany, Austria-Hungary, and the Ottoman. In the battle betwen the United States and the Central Powers, the United States along with the rest of the Allied Powers won.
The four allied powers before the United States joined the war included the Russian Empire and French Republic. The allied powers also included Italy and the British Empire.
The major allied powers were the United States, Britain and France.
The allied powers consisted of the United States, France, England, and Russia.
The United States the Central Powers and the Allied Powers
franch
The Allied powers were Britain, France, Russia, the United States, Canada and Australia. The Axis powers were Germany, Italy, and Japan.
The allied powers was: RUSSIA, FRANCE, AND BRITAIN LATER JOINED BY THE UNITED STATES. The central powers were: GERMANY, AUSTRIA-HUNGRY, ITALY, BELGIUM AND THE TURKISH.
The alliance was between Britain, France, and Russia. Later joined the United States during World War I.
United States, United Kingdom and Soviet Union.
The Allied Powers included the United Kingdom (Great Britain), France, Belgium, Serbia, Montenegro, and Russia. The opposition, the Central (Axis) Powers, consisted of Germany and Austria-Hungary. In 1914, Japan joined the Allied Powers
ALL Allied powers. They included the United States, United Kingdom, France, and Italy among its leading members.