What were some things steel was useful for?

steel are used widely in the construction of roads, railways, other infrastructure, appliances, and buildings. Most large modern structures, such as stadiums and skyscrapers, bridges, and airports, are supported by a steel skeleton. Even those with a concrete structure employ steel for reinforcin

Answer: Skyscrapers

Explanation: Steel was a light heavy duty material, which allowed buildings to be taller, and be more stable