Despite the endless crises that pervade the world, in reality we are living in the most peaceful time in world history, ever. In fact a term exists called the "Pax Americana."

In WWI some 15 million were killed. In WWII some 50 million were killed. Since America became the most powerful democracy in the world there have been many conflicts, but none have approached such figures.

I think the costs are obvious, though. It's a money drain to be the sole remaining superpower, and we end up angering a lot of countries. If we weren't the world police, conflicts might spiral out of control and cost millions of lives. However, WWI and WWII are amongst the most noble causes to have fought for, as opposed to these controversial small wars we deal with now.

It's a double-edged sword being on top.