With each day, and each violent activity often linked to terrorism, reasonable people who like to travel get even more reasonable. Or concerned. Or paranoid. Or even scared.

Pick an adverb. The uncertainty of traveling abroad — be it in one direction to Europe or in the other to Asia — understandably may leave North Americans more likely to pick a cruise ship departing and returning to a North American port. Not that there are any guarantees that doing so will keep you from being an unsuspecting victim of terrorism.

But even seasoned travelers are at least having second thoughts. Why fly internationally to get on a cruise if you can fly domestically, or better yet drive or take ground transportation to a port of departure?

This is good (okay, more comforting) news for cruise lines with ships that primarily visit the Caribbean, or assorted other warm-weather spots in the Western Hemisphere. Since a Caribbean cruise still out-ranks all others, that would be most of them, yet many have shifted their investments — and some of their ships — to Asia the last couple of years, which in today’s world could mean counting on a local (Asian) clientele.

For North Americans, there is no shortage of options. A quick count shows that there are 21 cruise homeports in this continent: Fort Lauderdale, Miami, Port Canaveral, Tampa, Jacksonville, New Orleans, Galveston, Houston, Charleston, Baltimore, Norfolk, Bayonne, New York, Los Angeles, San Francisco, Vancouver, Anchorage, Boston, San Diego, Seattle, Montreal.

So if you’re an avid cruiser who’s reluctant to fly afar to get to a ship, pick a port.

You may find many kindred spirits.

In the news…

• Two biggest ships (both Royal Caribbean) in southern hemisphere meeting in Sydney

Today at portsandbows.com: Christmas markets with Viking in Europe

Norwegian Getaway
7 nights
December 13, 2015
Miami (return): Great Stirrup Cay, Ocho Rios, George Town, Cozumel
Inside: $649
Cost per day: $92
www.ncl.com