I think it's the Industrial Revolution. Let me know if this helped!
Answer:
According to Article I, section 3 of the US Constitution, each Senator of the United States must be: - At least thirty years of age, - A citizen of the United States for nine years, - A resident of the state for which he or she is chosen; he or she shall not, when elected, be an inhabitant of such state.
That depends what you mean by early, do you mean the civilizations of Egypt or Mesopotamia or Israel.
