Corollary announced the United States intention to take their place
Harappan Civilization's writing has never been decoded. Harappan Civilization is a part of the Indus Valley Civilization. The languages of the Harappan Civilization belong to the Bronze Age and they are still today a mystery. This language is totally unattested to any source that is readable. This is one mystery that is yet to be solved.
The quote is referring to the 19th amendment being passed which gave women the right to vote
The Incas built a large system of roads that went throughout their empire, Commoners were not allowed to travel on the roads. Communication was accomplished by runners on the roads.