"Edit: this is for non US citizens. US citizens don't need to answer any questions at entry, but be prepared to be taken aside for screening"
Also be prepared to answer questions about your religion... regardless of if you're a citizen or not. we finally have a religious test to enter the country..
https://www.theguardian.com/commentisfree/2017/feb/26/muhamm...
http://www.cnn.com/2017/02/13/us/citizen-nasa-engineer-detai...