Germany 1930s - hyperinflation; Argentina 1990s - hyperinflation; USA 2010s - quantitative easing.
These can also be real problems even for the richest nations.
As you correctly mention - Iraq [1] & Libya [2] were essentially currency invasions and NOT oil invasions. Millions of innocent lives lost to keep the USD propped up. Wars that would make no sense under BTC.
[1] http://content.time.com/time/magazine/article/0,9171,998512,... [2] http://www.thenewamerican.com/economy/markets/item/4630-gadh...