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The Dakota territory accounted for much of the northern reaches of the Louisiana Purchase. Organized as a territory in 1861, it ceded western parts to what are now Montana and Wyoming, leaving the area now occupied by North and South Dakota in the 1880s as a single territory. It was divided yielding two states, both admitted in the same bill that admitted Montana and Washington in 1889.
Suppose it hadn't been divided, and there were a single state known as Dakota? Assuming all else goes approximately as it had:
It would have 149, 084 square miles, making it the fourth largest in area behind only Alaska, Texas, and California.
It would be home to ~1.61 million people, ranking it 41st, just behind Idaho and just ahead of Hawaii.
Probably Sioux Falls would be the largest city.
There would have been a flag that may have looked like this from 1912 until 1959:
That's right: 47 stars. What else might have changed?