I'm flying from the US to Mexico City and then on to Havana for a few days later this year. I'm a little conflicted about whether I should write "Cuba" on the blue form asking me what countries I've visited. I'll be flying from Mexico City to Las Vegas. I'm concerned that the CBP officers in Las Vegas will not be as used to people coming from Cuba and that I might face some trouble if I openly declare/flaunt it.