“They asked me about Scotland—that one I won’t talk about yet,” Trump said Sunday, referencing another country divided on leaving the U.K. The Trump family also owns a golf ​resort in Scotland, which voted against independence from the rest of Great Britain in 2014. “I’ll save that for another day.”

A heated debate

The island of Ireland was divided in 1921 following the Irish War of Independence. While a northern region of six counties remained part of the U.K., the rest of the island, comprising 26 counties, became the Irish Free State, which eventually became a sovereign republic in 1949.

From the 1960s, tensions in the north between largely…

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