Confidence is on the rise -- in Europe at least -- as dozens of river cruise ships ply the rivers and canals of Europe. In fact, river cruises have been operating safely here since June -- and I was fortunate enough to be on one of the first, A-ROSA on the Douro. (There has been just one COVID-19 outbreak, on a Croisi river cruise ship in Portugal at the end of its cruise, infecting two passengers and five crew members.) However, all these lines have one thing in common -- they are all European. The the huge fleets from US-based cruise lines in Europe such as Viking, Un