Drawing the Line
Official time zones were first implemented in the United States in 1883, for the railroads. The three time zone demarkation lines in the lower 48 states run mostly on logical courses, along rivers or state lines, with a few confusing exceptions;

The line between Pacific and Mountain begins in the north on a screwy path east to west through the state of Idaho, making the north part of the state an hour behind the south. Oddly, it jumps into Oregon for several hundred miles. Utah is wholly MT, except for a two-mile wide strip down its entire western border. The line jumps onto the Nevada border and follows the Colorado clean to Mexico, except that the entire Grand Canyon (and only the Grand Canyon) is in PT, which makes scheduling helicopter flights over the canyon a real mess.

The Mountain / Central line tries to follow the Missouri River through North and South Dakota, and clears Nebraska and Kansas with little trouble, save a curious, one-mile dip into Colorado. It then runs pretty much along the Texas / New Mexico border to Mexico.

Dividing Central and Eastern times is a mess. The line comes out of Lake Michigan, and right off the bat, it takes a huge bite out of northwest Indiana, rather than taking the Illinois / Indiana border south. It then hits this border, and the Wabash River, down to a town named Mt. Carmel, where it u-turns north for a while and zags its way to Kentucky. Here it bends to the east for a hundred miles or so, and Tennessee brings it back west, down to the Alabama / Georgia border, where it dives straight down to the Florida line, picking up the Apalachicola River, a logical route to the Gulf of Mexico - but, no...

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