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Through the break up of the Oregon Territory, Washington Territory, Montana Territory and Wyoming Territory.

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Q: How were the borders of Idaho formed?
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Related questions

What Canadian province borders Idaho?

Idaho borders British Columbia


What states border Washington and Oregon to the east?

Washington borders Idaho to the east and and Oregon also borders Idaho to the east.


Which northwestern state borders Idaho and Oregon?

Which northwestern state borders Idaho and Oregon?


What state borders Idaho to the north?

No state. Canada borders Idaho to the north.


Which state borders Montana on the west?

The State of Idaho borders the State of Montana directly to the West.


What borders the state to the east of Montana?

Idaho


Which states western borders is closer to the Pacific Ocean that of Nevada or that of Idaho?

Nevada's western borders are closer to the Pacific than Idaho's western borders.


Which state is northeast of Idaho?

Idaho borders Montana to the northeast.


Which state is to the west of Vermont?

Idaho borders Washington and Oregon to the west.


What border is for Idaho and Oregon?

Idaho borders Wyoming Oregon to the west.


What state borders six other states and Canada?

Idaho


What state borders oregon from the east?

Idaho borders Oregon from the east.