The importance of steelin construction lays on the fact that it is a stronger material, and it is a ligther material than iron, whihc was used prior to steel to many constructions, being stronger and lighter it gives the engineers the possibility to create bigger taller buildings that weighted less tha before this scalated the possibilities to build taller buildings.
Answes: The first was Christianity and the Catholic Church (as well as the official language of the Church, Latin). The second was feudalism. The expansion of Catholic Christianity and the feudal system had a profound impact on western Europe in the medieval era.
The sudden end to the slave economy would have had a profound and killing economic impact in the South where reliance on slave labor was the foundation of their economy
