But the right is more precious than peace, and we shall fight for the things which we have always carried nearest our hearts—for democracy, for the right of those who submit to authority to have a voice in their own governments. . .

The most likely purpose of including this in the last paragraph is to
establish a sense of patriotism and support for the war.
explain why the United States has a system of democracy
describe the economic interest the United States has in the war.
convince citizens to dedicate themselves to the war effort.