Why didn't the founding fathers put slavery in the constitution?

The revolutions in latin america in the 19th century resulted in political independence from europe the end of slavery in each country the establishment of stable democracies social and economic equality for all

The "nationalists" and fascists battled against the "republicans" and communists in a civil war in the 1930s in

How does the pyramid of giza include art, science, math, or a need for infrastructure?