I believe for a ship to be US flagged it must be built in the US, use a US crew, and follow US rules. Which makes things relatively expensive. https://www.cnbc

I believe for a ship to be US flagged it must be built in the US, use a US crew, and follow US rules. Which makes things relatively expensive. https://www.cnbc.com/2015/04/28/us-ship-definition-by-flag-or-cargo.html https://www.cnbc.com/2015/04/28/us-ship-definition-by-flag-o...