Although this depends somewhat on the war in question, in many cases a longterm cause of war is the growth of "nationalism" or a strong sense of pride in your country, since this generates an "us vs. them" mentality.
Answer:
Rivers and Oceans provided possiblities for trade, transportation, food, and a growing economy.
Explanation:
Because of the Rivers and Oceans teleporting goods from one place to another was a lot cheaper and effecient. On top of this, there was a supply of food with the ability to catch underwater sea life (like fish). This helped spread Europe and its economy significantly.
Since Germany had to pay a LOT of war reparations after WWI, Germany didn't have much money to pay for what repairs they needed. Since Germany's economy was in a tight spot, people were desperate and Hitler was their hope.
It was widely accepted but many people today still doubt it.
People from the enlightment period. aka bhudists believed that nature should be honored. think of hippies. Hope this helps :D
