It allowed for steel to be produced much more cheaply and efficiently, This made steel more available so enough is produced to build skyscrapers.
Answer: I believe the answer is A but im not very sure.
Democratic ideals were incorporated into colonial governments through many key events in the history of the colonies; firstly through the <span>Formation of the Virginia House of Burgesses and the signing of the Mayflower Compact, representational government and agreement for self-government; with the petition of rights, the colonists then established, with the formation of the colonial government and the separation with the Crown, and the voting system enabling self-government, allowed for the democratic opinion and voice of the colonists to be heard.</span>
Christopher Columbus was the first explorer to sail what are today the Caribbean Islands between North and South America. He sailed for Spain. Hope it help!