Final answer:
The most accurate summary of the paragraph is that the existence of women's suffrage in half of the states creates an imperative for its establishment in the remaining states, reflecting an unavoidable trend towards universal women's suffrage in the nation. Option C is the correct answer.
Step-by-step explanation:
The best summary of the arguments in the sixth paragraph is C. Half of the other states already allow women to vote, creating an imperative to allow suffrage in other states. This reflects the argument that the existing partial suffrage for women in the United States set a precedent that makes national women's suffrage inevitable. The sentiment expressed by Elihu Root about the incompatibility of democratic and autocratic practices in a single nation parallels the incongruity of having a nation where only some women can vote. The emphasis is on the natural progression from partial suffrage in several states to universal suffrage throughout the entire nation.
By 1919, the movement for women's suffrage had gained considerable momentum, with thirty states and territories recognizing women's right to vote in some form, and the U.S. Senate approving a women's suffrage amendment. Carrie Chapman Catt and others used the patriotic climate during the First World War to push for universal suffrage, highlighting the hypocrisy of fighting for democracy abroad while denying it at home. With established precedents and growing public support, universal women's suffrage was becoming less a question of 'if' and more a question of 'when' and 'how'.