War's bring growth (stimulation); a lack of war brings decline (lack of stimulation).
innovation, war, religion
They were too advanced so to bring them down other civilizations declared war
strenghtened royal authority at the strength of nobles
There was a decline in the population as a result of the war.
The Peloponnesian War
they went to war with Greece
war
There were many civilizations destroyed by war. It depends on what kind of civilization you are talking about. A few off the top of my head are the Inca and the Aztecs by the Spanish conquistadors. Mainly western civilizations such as the Mycenaean, and the Persians.
The effects of the Iran-Iraq War of 1980-1988 is that it led to a decline in the economic growth in the region. It also led to displacement of people from their home and also led to the death of very many people.
The Thirty Years' War brought about decline in power of the Catholic Church, decline in feudalism, decline in power of the Holy Roman Empire, and the rise in the Swedish Empire and Bourbon Dynasty.
to go to war... with other civilizations
war