From income tax to Prohibition, the Constitution underwent a lot of change in the early 20th century, but perhaps none was more important or positive than the 19th Amendment, which formally granted women the right to vote. The women's-suffrage movement in the U.S. dates as far back as the Revolutionary War, but women's-rights trailblazers, such as Elizabeth Cady Stanton, Susan B. Anthony and Lucretia Mott, spearheaded the strong push for equal voting rights in the mid-19th century. After the Seneca Falls Convention in 1848, the rallying cry for women's right to vote became a yell too loud to ignore. In 1920 — 41 years after it had originally been drafted — Congress ratified an amendment that said: "The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of sex." Although most of the pioneering suffragettes died before winning the right to vote, to this day every member of the fairer sex has them to thank.