This issue was resolved when New Mexico sued Colorado in 1919, and in 1925 the Supreme Court ruled that the markers placed during the initial surveys were the actual borders, even if the markers were off in some locations (this includes the Four Corners Monument).
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The border between the two territories was congressionally defined as the 37th parallel north by the 31st United States Congress.
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In 1861 the 36th United States Congress transferred land previously allocated to the Utah Territory, to the newly created Colorado Territory.
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