After the events of September 11, newspapers reported an upsurge of patriotism across the land. Americans put stickers on their car windows reading, "United We Stand" and wore T-shirts with images of the American flag. Even on college campuses, students rallied to express patriotic sentiments about America. Sixties boomers, long accustomed to scoffing at patriotism as "flag-waving," now discovered in themselves a surprising urge to wave flags.
A very good article on what it means to feel patriotic to one's country.