California is the closest contiguous state to Hawaii
If you discount Hawaii which is all islands, and if you discount any other islands that are part of the US, my guess is Newfoundland.
The US territories of Puerto Rico and the US Virgin Islands are the closest US territories, being 1200m away of the southeastern part of the Main land.
Cuba- 67 miles from the Florida Keys.
The closest city to Mt. Hood in the United States is Government Camp, Oregon.
Philadelphia
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Miami.
Honolulu, the capital of Hawaii is the closest US state capital to the equator. The closest U. S. territorial capital to the equator is Hagåtña, Guam.
naalehu, Hawaii
The US and China do not meet at any point on the map.
The closest Canadian city to the US border is Surrey, located in British Columbia. It is part of the Greater Vancouver area and shares a border with the US state of Washington.