<span>A parliamentary democracy does not have an individual executive but a presidential democracy does.
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A potlatch involves giving away or destroying wealth or valuable items in order to demonstrate a leader's wealth and power. ... The word comes from the Chinook Jargon, meaning "to give away" or "a gift"; originally from the Nuu-chah-nulth word paɬaˑč, to make a ceremonial gift in a potlatch.
Harriet tubman was the famous slave
The unification of Germany disrupt the balanced of the major powers of the world during the 19th century because it emerges as a world power immediately. Also the unification in the process humiliated France which is another world power defeating France in the Franco-Prussian War. Also it changed the political landscape and world alliances due to new power that emerge.