Pertaining to land and sea crossings for US Citizens. Source: https://www.ambassadorpassportandvisa.com. Information shared above is the personal opinion of the author and not affiliated with the website.

1. PASSPORT FOR A CRUISE
Passports are required for all travellers, including citizens of U.S. and Canada, who
enter or re-enter the United States by air, land or sea.
Regarding cruises to destinations in Mexico, Canada, the Caribbean, the Bahamas
and Bermuda, there is a notable exception to this US passport rule, pertaining to
land and sea crossings for US Citizens:
US Citizens on closed-loop cruises (cruises that begin and end in the same U.S.
port) and travel to destinations in Mexico, Canada, the Caribbean, the Bahamas, and
Bermuda are able to re-enter the United States with proof of citizenship other than a
passport or passport card.
Source: https://www.ambassadorpassportandvisa.com. Information shared
above is the personal opinion of the author and not affiliated with the website.