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The Dakota Territory was incorporated as a US territory on March 2, 1861. On November 2, 1889, the remains of the territory became the states of North Dakota and South Dakota.

So, as of August 1, 2011, "Dakota" would be 150 years old.

However, if you are talking about the land which makes up the area of the Dakotas, it is as old as the earth is.

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13y ago

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