1)When did WW1 start and end
2) What countries were involved in Ww1

1) 28 July 1914

2) Germany, Austria-Hungary, Bulgaria and the Ottoman Empire fought against Great Britain, France, Russia, Italy, Romania, Japan and the United States.

Explanation:

hope this helps you!!

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1) July 28, 1914 – November 11, 1918

2) Germany, Austria-Hungary, and Turkey) against the Allies (mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States).

Explanation:

1) On June 28, 1914, a young Serbian nationalist shot and assassinated Archduke Franz Ferdinand, the successor to the Austro-Hungarian Empire (Austria), in the city of Sarajevo, igniting World War I. The murderer was a supporter of the Kingdom of Serbia, and Austrian troops invaded Serbia within a month.

After four years of fighting and the deaths of 8.5 million troops as a consequence of battle wounds or disease, the Allies won World War I. More information about the Treaty of Versailles may be found here.

2) During World War I (1914–1918), France, Britain, Russia, Italy, Japan, and the United States led a coalition of countries against the Central Powers of Germany, Austria-Hungary, the Ottoman Empire, Bulgaria, and its colonies, known as the Entente Powers.

(Hope this helps can I pls have brainlist (crown)☺️)

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.

the answer to this question is the third option. hope this