Which according to your avatar color is also your political faction.
For examples of very nationalistic governments look at Saddam's Iraq, the Lebanese Falange, and oh, Germany in the late 30s/early 40s...
I'm not arguing that what Germany did was right. However, you have to admit that nationalism was very effective for one country to steamroll across Europle. The people were dedicated to the sucess of their country.
If being nationalistic would enable the USA to take over a whole continent, I'd be as anti-nationalistic as I could.