Trivia: Following a steel shortage, what kind of ships were built during WWI?
Correct Answer: Concrete
So why is this answer correct? : A side effect of the war was shortages of almost every construction material. Ships were normally built with steel, but shortages prompted improvisation. President Woodrow Wilson ordered the construction of 24 concrete ships. They were completed too late to join the war efforts, but the same concept was applied to make concrete ships used during WWII.