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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.
kuai
Philadelphia
Miami.
naalehu, Hawaii
The US and China do not meet at any point on the map.
Washington
Miami, Florida
McAllen, Texas