In this chapter:

((1)) ** .—** The term “American vessel” includes—

((A)) a documented vessel with a registry or coastwise endorsement under chapter 121 of this title;

((B)) an undocumented vessel owned or chartered by or made available to the United States Government; and

((C)) a tug, barge, or other watercraft (whether or not documented) owned by a citizen of the United States and used in essential water transportation or in the fisheries, except only for sport fishing.

((2)) ** .—** The term “cargo” includes a loaded or empty container on a vessel.

((3)) ** .—** The term “transportation in the waterborne commerce of the United States” includes the operation of a vessel in the fisheries, except only for sport fishing.

((4)) ** .—** The term “war risks” includes, to the extent the Secretary of Transportation determines—

((A)) any part of a loss excluded from marine insurance coverage under a “free of capture or seizure” clause or analogous clause; and

((B)) any other loss from a hostile act, including confiscation, expropriation, nationalization, or deprivation.