Seven feet tall.  Ten inches square. Eight hundred pounds. Once, 720 of them. Every half-mile from Minnesota to Montana. Standing since 1891 or 1892. The only stone sentinel of its kind in the nation. That’s the legacy of the red quartzite boundary markers the federal government installed after Dakota Territory was split, in 1889, into the 39th and 40th states of North Dakota and South Dakota. The federal government wasn’t being heavy-handed in determining the boundary; they were “reluc


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