The European countries involved in World War I had long standing alliances and treaties, through familial and diplomatic relations. Once the Austro-Hungarian empire fired on Serbia, all the alliances were called in, causing more and more countries to enter into the war.
France and Germany were the last two countries in World War 1.
How many countries took part in the world war two?
William Jennings Bryan opposed the United States entering World War 1 because he had been known for peace treaties with at least 30 nations. With the United States entering into the war at least on of those countries would be allied with Germany. Another theory is that he wanted to protect America and by sending troops overseas to fight, America would be less defended than if all the troops stayed at home.
The Great Depression
Vladimir Lenin withdrew Russia from World War 1 by entering into the Treaty of Brest-Litovsk.
Japan
It helped win the war
America actually made a profit out of WWI. They sold supplies and rations to allied countries.
Yes. That's basically how all wars start, with arguments between countries that can't be resolved by peaceful means.
No war without cause.
A world war is a war who is included every countries
The USA joined World War I after the Germans sank the Lusitania, a British cruise-liner, containing hundreds of Americans. Their entrance is similar to Belgium's, as they were attacked by Germany. Other countries entered the war for reasons of alliances or reasons of wanting to gain land.
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When countries all over the world are in a war.
They wanted to drag the United States into a war with Mexico that would prevent it from entering World War I.
There goals where to become a world power.
To make the world safe for democracy