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The main participants in World War I were Germany, Austria-Hungary, Ottoman Empire, Bulgaria, Serbia, Russia, France, United Kingdom, Belgium, Romania, and the United States.

en.wikipedia.org/wiki/World_War_I

Bulgaria declared war on Serbia, 12 October and joined in the ... The Serbian army, fighting on two fronts and facing certain ...

www.history.com/topics/world-war-i/world-war-i-history

Find out more about the history of World War I History, including videos, interesting articles, ... The One Thing You Should Know About WWI 4min ... Germany began fighting World War I on two fronts, invading France through neutral Belgium in ...

WWI

aenet.esuhsd.org/citizenship_lessons/connie/wwI_q.html

The first World War began as a local war between Austria-Hungary and Serbia in 1914. It grew ... 1. The Allies fought against the Central Powers in World War I.

www.britannica.com/event/World-War-I

World War I was one of the great watersheds of 20th-century geopolitical history. ... were fighting heavily on two fronts before the U.S. entered the war in 1917.

m.historyextra.com/feature/first-world-war/who-was-involved-first-world-war-who-was-each-side

Jan 6, 2015 ... WW1 allies the German Reich and Austria-Hungary. ... The war quickly involved countries not part of the Triple Entente, so the opposing side ...

www.historynet.com/world-war-i

World War I summary: The war fought between July 28, 1914, and November 11, ... A number of smaller nations aligned themselves with one side or the other.

www.ducksters.com/history/world_war_i

World War I was a major conflict fought between 1914 and 1918. ... Germany, Austria-Hungary, and Bulgaria on one side and Russia and Romania on the other.

www.bbc.co.uk/newsround/28585905

Jun 29, 2016 ... Meet Horace, the 14 year-old boy from Leeds who fought in WW1. The opposing sides were: Germany, Austria-Hungary and Italy who were ...

www.quora.com/Why-was-World-War-1-fought

I was going to write a whole answer for this, but honestly, I don't think anything I can write would be better than Captain Edmund Blackadder's explanation. Baldrick: ...