How did olmecs become rich?

Why is Charlemagne called Charles the Great? What year did the stalemate of world War 1 begin? How many miles did vasco da gama travel from Portugal to India? Where was Vince Lombardi speech given? What were the socialist republics of the USSR in 1922? Who was edward the thirds mother? How did life in Canada change during World War 1? Was the Atanasoff-Berry Computer programmable? What were Mussolinis ideas of fascism? Why did the public go from rejecting the Vietnam war memorial to accepting it? Which group opposed to war with Mexico? What is the extent of Ted Nugent's military service? Why immigrants should stay in the US? How was the food supply in Plymouth? What event caused many Americans to worry about nuclear war? What four countries where the Jews were arrested and sent to concentration camps? What was the conflict of the Gettysburg Address? Who won the siege of Londonderry? Why were the wampanoag and the pilgrims interested in forming an alliance? What did army men wear in World War 2?