the avaliability of inexpensive steel, the most prominent, thus with the first industrial Revolution, was in relation to inventions and discoveries, this time what boosted was undoubtedly the oil, the combustion engine, the use of steel and the use of water force in the generation of electricity , with the creation of hydroelectric plants.
1. they finally joined the war because Germany embarked on a deadly gamble. Germany sank many American marchent ships around the British isles which prompted the American entry into the war
