Throughout history there have been too many wars to list here--wars rage on to this very day.
They all lived happily ever after
The same reason all wars happen: Greed of The Chaldean thieves. === ===
Yavapai Wars happened in 1861.
Space Wars happened in 1977.
The Persian Wars lasted from 499-448 BC. The Pelopenesian Wars lasted from 431-404 BC So the answer is: The Persian Wars happened first.
Because WWI was considered to be "the war to end all wars." Unfortunately that's not happened
Meteos Wars happened in 360.
Ozma Wars happened in 1978.
Mytran Wars happened in 2009.
X-Wars happened in 2002.
Gemini Wars happened in 2012.
Carnatic Wars happened in 1746.