It's also half the reason behind the Jones Act. Shipping between US ports must be done with US-made ships with US crews. If it weren't for this, US shipyards wo

It's also half the reason behind the Jones Act. Shipping between US ports must be done with US-made ships with US crews. If it weren't for this, US shipyards wouldn't have enough orders or expertise to stay open, and thus wouldn't be available for military orders in case of war.