Joe please remember when talking about the foolishness of Brexit that the USA would never have entertained the idea of joining such a single market or would ever have contemplated surrendering to any degree whatsoever sovereignty or any part of the decision making process to anyone else.

I can see nothing wrong at all with "patriotism" on the other hand I do not think that "nationalism" has any redeeming features whatsoever:

British National Party
National Socialist German Workers' Party

Are but two examples.