Washington DC
I recommend that every family visit Washington DC at least once. If possible, consider going twice - once when your kids are just starting to learn about US history, and once when your kids are teens.
Activities in Washington DC can be very affordable because most of the museums and tours are free. However, you will need to prepare in advance, because you'll have to go through your members of Congress early in order to get access to some places.
Hotels right in Washington DC can be expensive, but there are many suburbs offering public transportation into the city.
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