It should be war, famine, and class struggles. I really hope this helps, let me know if you need clarification.
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!
20- the commencement of Presidential Term and Succession
21- the repeal of the 18th amendment
22- Two-Term Limitation on President
23- District of Columbia Presidential Vote
24-Poll Tax Requirement in Federal Elections
25-Presidential Vacancy, Disability and Inability
26- being able to vote at 18
27-Congressional Compensation
She became the first woman to run the Boston Marathon as an officially registered competitor:)