DAN GAINOR: The England we love is lost. If we don’t change, America will be, too.

I went to England on a history vacation. It turned into an archaeological expedition, uncovering the bones of a once-great civilization.

All the tourist sites are still there. You can still see the changing of the guard at Buckingham Palace, recall the “V” for victory in the Churchill War Rooms or be inspired to pray at Westminster Abbey. But those are mere historical artifacts, like the pyramids of Egypt or the Acropolis in Greece. The ideals and most of the people who believe in them are long gone.

I was in London less than 24 hours before a terror attack killed two people in a Manchester synagogue. Police also killed the terrorist, a Syrian-born, 35-year-old immigrant named Jihad Al-Shamie, who they said had pledged himself to ISIS. Two innocent Jewish people are dead and a walking, talking metaphor was the cause. Jewish citizens admitted the assault was shocking but not surprising, given the rise of antisemitism in England.

As Mark Steyn warned 20 years ago: It’s the Demography, Stupid. “Most people reading this have strong stomachs, so let me lay it out as baldly as I can: Much of what we loosely call the Western world will not survive this century, and much of it will effectively disappear within our lifetimes, including many if not most Western European countries. There’ll probably still be a geographical area on the map marked as Italy or the Netherlands–probably–just as in Istanbul there’s still a building called St. Sophia’s Cathedral. But it’s not a cathedral; it’s merely a designation for a piece of real estate. Likewise, Italy and the Netherlands will merely be designations for real estate. The challenge for those who reckon Western civilization is on balance better than the alternatives is to figure out a way to save at least some parts of the West.”