also worth noting: as a US citizen re-entering the country you do not have to present anything more to a customs agent than your passport. You are not required to answer any questions at all. Where youre from, where you were, what you did, nothing, however it may result in an inspection of your bags, so it depends on whether your interpretation of liberty is based on personal convenience. Disclosure: ive done this op…
But as a practical matter they can detain you and do a more intense search than they would if you didn't dig your heels in and silently hand them your passport. You'd be surprised how intrusive a search absent reasonable suspicion can be at the border - they just don't have the resources to do one on everyone.
The info I've been asked for at the border is usually info the government could get if it wanted (Ex: asking where I visited when they have flight records and are looking at my passport stamps)
I'm fine with doing a little participatory security theater if it gets me home quicker and has no real cost to me.