There is a long, long literature on that. Some of it exaggerates the differences between the two. Some of it raises important questions about the relationship between patriotism and nationalism. You ought to read more before you make such a pat and unqualified identification of nationalism with patriotism.
I guess I hit nerve. You need to re evaluate your identification and what patriotism means, not me. It seems your loyalties to the USA take a back seat to what?
Explain or give an example of how a patriot is not also a nationalist? Benedict Arnold perhaps?