What you have to appreciate is that our invading countries and fighting wars against them is usually good for them.
For instance, Argentina. The first war against them helped them form a national identity. The second helped them get rid of their military junta and restore democracy.
Honestly, countries should be paying us to invade them. Of course we did allow many of them to show their gratitude with money, national treasures and cheap labour.
We're basically the Mitt Romney of nations. If your country isn't working, we come in, strip your assets and get you back on the right path for a very competitive commission.
You're welcome.