When did World War 1 start and end?

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World War I as a declared state of war lasted from July 28, 1914 to November 11, 1918.

After a decade of unstable alliances and military buildups, World War I was triggered in 1914 by the assassination of Archduke Ferdinand. It ended in 1919 with the Treaty of Versailles.

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world war 1 started in July 28 1914 and ended November 11 1918
July 1914

It ended November 11, 1918
The war began with the declaration of war by Austria-Hungary against Serbia on July 28, 1914, and within a week it had spread to involve most of Europe. The war ended with the Armistice on November 11, 1918. This was only an agreement to cease fighting, not a surrender. The formal peace treaties officially ending the war did not come until later, with the Versailles Treaty bringing an official end to the war with Germany on June 28, 1919, but there were other treaties. The final Treaty was the Treaty of Lausanne, which brought to an official end the war between the Allied Powers and Turkey, August 23, 1923.
The beginning of World War 1 is generally considered to have started with the spark of the assassination of the Archduke Franz Ferdinand of Austria on June 28, 1914. The first official war declaration/invasion was on July 28, 1914. The war ended on 11-11-1918 (Armistice Day).
World war one started in 1914 and ended in 1919 but some people say that it ended in 1918 but that is when the fighting and battle stopped.
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What started and ended World War 1?

Answer . Im not sure if you meant dates, if so it was 1914-1918. If you wanna know the reasons then you have some pretty involved research to do, it is not an easy question

When did World War 1 start and end Why didn't it end by Christmas liked they planned?

I'm not sure when it started, because I'm like the fifth grade, and we didn't cover that yet, but I think it didn't end by Christmas like they planned because well maybe thing

How did the end of World War 1 prepare Germany for the start of World War 2?

When WWI ended, Germany had to pay $33 billion in reparations and were economically and territorially ruined. They were deprived of all of their new land and were in poor shap

Why did World War 1 start and why did it end?

The war started in the summer of 1914 when the heir to theAustro-Hungarian throne was murdered by a Bosnian man. The Bosnianwas part of a rebel group that was helped by Serbia