Adolf Hitler was a dictator, and so is Fidel Castro.
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.
Italy and Germany were able to unify, in a big part because of B) nationalism. Due to a culture and ideology of the unity of these regions based on national identity there were movements that began to push these societies towards national unification.
Before the USS Maine exploded, the United States was trying to expand as a world power. Thus, many Americans blamed Spain for the explosion of the USS Maine because it gave them a reason to declare war on Spain and take control of Spanish territory in the Pacific and Caribbean.