To create a new nation

George Washington did not promote the New Nationalism of the American System. He was no longer involved in politics when this happened.

No. Nationalism can occur peacefully, but by and large nationalism requires the realignment of borders and the establishment of new governments, such actions almost always lead to violence.

Nationalism by itself is a fine quality for any nation. With that said, if nationalism leads to a war, then that's quite a different situation. Also, sometimes nationalism creates problems for new immigrants and minorities.

Nationalism inspired the creation of new countries because it caused kingdoms to join together to achieve independence and developed a sense of pride.