More than a century ago, in the first attempts to shape the face of a nation open to people from all nations, the United States banned convicts, prostitutes and Chinese laborers from landing on our shores. Later, “idiots” were added to the list of forbidden immigrants. Alas, it was too early keep Donald Trump at bay.

But on this upcoming Independence Day, at a time when Trump’s response to our better angels is to go small, mean and tribal, an American ideal is in peril. Not open borders, which is something the United States hasn’t had since 1875, but open minds.

In committing economic suicide, Britain is trying to close the door and hide from the world. It felt good, no doubt, to tell those overbearing bureaucrats in Brussels to bugger off. We’ll stick with our bangers and mash without any interference from Europe! But the Brexit vote was also a drunken swing at those “others” remaking the image of a lost England. To hear the haters tell it, “Polish vermin” and brown-skinned hordes have overwhelmed the little island nation.

Trump wants us to follow the Brits into a corner of isolation — by race, religion and trade. His philosophy, the rant of a besotted boob making things up in public, is anti-American at its core. In rejecting our former colonial masters, we threw off monarchy, the class system and a state religion. We opened our doors to all nations, all religions, all opinions.