How was American industry an asset during the war

It was capable of producing among other things the largest merchant fleet in the world. it produced massive amounts of ships.

It was capable of producing among other things the largest merchant fleet in the world, 78 Capital Ships (Cruiser or Larger), 141 Escort Carriers, and almost 850 Destroyers (DD) and Destroyer Escorts (DE). It turned out more than 300,000 aircraft, 88,410 tanks and 2,382,311 jeeps and trucks.