Martin Hotze wrote in message If you plan such a trip (Cuba etc.) then
you should have a tourist visa.
Foreigners have a hard stand these days, esp. in the US.

I am thoroughly familiar with immigration issues as pertains to the
US. This month marks 25 years that I have been flying the Caribbean. A visa
waiver is valid for re-entry into the US for 90 days from the
date of first entry from anywhere in the western hemisphere. To prove the
date of first entry, the person(s) must present the green stub of the I-94
form which was validated at their original entry along with their passport.

D.