"We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness." -- The Declaration of Independence, 1776 -- "The United States themselves are essentially the greatest poem," Walt Whitman wrote, but the nation was conceived in prose. Other countries have national holidays that commemorate feats of revolutionary or military glory.