Question

how many World War happen in the world and say it's each war's reason​

Answer 1

Answer:

2 world War have happened so far.

WORLD WAR 1 reason :

immediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. ... When Russia began to mobilize to defend its alliance with Serbia, Germany declared war on Russia.

World War 2 reason :

Thebimmediate cause of World War I that made the aforementioned items come into play (alliances, imperialism, militarism, and nationalism) was the assassination of Archduke Franz Ferdinand of Austria-Hungary. ... When Russia began to mobilize to defend its alliance with Serbia, Germany declared war on Russia.

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