I mostly lurk Trawler forum as I am boatless at present, but love the info and very good level of discourse.
On the subject of the Jones Act that forces foreign flagged vessels to stop in foreign ports in between stops at US ports, I have much experience from 40 years of planning, engineering and building ports all around the Americas.
The US is quite unique amongst countries of the world with its far flung territories for which this law applies: Alaska, Hawaii, Guam, Puerto Rico, etc. This requires US flagged vessels and crew for commercial trade between these locations.
The downside for US consumers is very high shipping costs compared to what would be available from foreign flag carriers. The upside includes ship building, repair and maritime business and careers for Americans.
It creates strange business opportunities: that is why BC has deep sea aggregate export terminals at Sechelt, Texada Island and Port McNeil that ship sand, gravel and rock to California. It is cheaper to ship these relatively low value commodities to the US from Canada on foreign flag Panamax vessels (including Canada Steamship Lines self unloading bulk carriers) than tug and barge from much closer Westcoast US quarries.
It also means that it is cheaper (at least when I last studied it for an Alaskan mining company), to bring in diesel on tankers direct from the Philippines to Alaska compared to US West Coast refineries).
There are always winners and losers when regulations like the Jones Act exist. The current COVID-19 issue on cruise ships is merely a blip in the history of this law.
Cheers,
Steve