State of Idaho
Idaho is the name of a US state, not a capital. Its capital is Boise.
The noun 'Idaho' is a proper noun, the name of a state in the US; the name of a specific place.
The correct spelling, if you mean the State, is Idaho.
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ID
Idaho
Seattle, Miami and Chicago are cities. Idaho is a U.S. state. Idaho City is the name of a city in Boise County, Idaho.
Esto perprtua is the official state motto of Idaho. Translated it means "Let it be perpetual."
The state fruit of Idaho is the huckleberry.
Idaho State University is located in the state of Idaho.
Yes, "Idaho" is a proper noun. It is the name of a state in the United States.