Well, all the civilizations did sacrifices, but ( you may need to check just be sure) i think the Incans did the least of it. The Mayans did it a bit more regularly then the Incans and the Aztecs did the most. hope this helps!
The Wilmot Proviso prevented new states from becoming slave states, the compromise enabled them to become slave states if popular sovereignty wanted them to be. California was allowed to become a new, non-slave state, and in return Slavery was enabled and allowed in the south, strengthening fugitive laws even more. To everyone it seemed like a victory for a while.
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The Romans used gold, silver, and bronze coins for trade and to pay taxes. Goods came to the Roman Republic from several regions outside of Italy. Roman soldiers were paid with goods from all over the region
It grew into a war involving 32 countries. The Allies included Britain, France, Russia, Italy and the United States. These countries fought against the Central Powers which included Germany, Austria-Hungary, Ottoman Empire and Bulgaria.