What does the enormous amount of human labor required for the construction of these megaliths suggest about the societies that built them

it suggests that the societies had a large population of enslaved people, and they might have been wealthy civilizations.

abraham lincoln issued the preliminary emancipation proclamation on september 22nd, 1862. it stipulated that if the southern states did not cease their rebellion by january 1st, 1863, then proclamation would go into effect.

answer; when the government fails to protect the fundamental rights of the people;