Answer:
In Russia, efforts to build communism began after Tsar Nicholas II lost his power during the February Revolution, and ended with the dissolution of the USSR in 1991.
The emancipation proclamation meant that all slaves still held in the rebellious states are now free. And Juneteenth is a holiday in which the day slaves where freed.
It was the refinement of the Bessemer process, first used in the United States in the 1860s, that allowed for the major advance in skyscraper construction. As steel is stronger and lighter in weight than iron, the use of a steel frame made possible the construction of truly tall buildings.
It's not Portland or boise, so C Los Angeles!
