On July 4, 1855, Walt Whitman published Leaves of Grass. From the preface (1855 Edition Hypertext):

The Americans of all nations at any time upon the earth have probably the fullest poetical nature. The United States themselves are essentially the greatest poem. In the history of the earth hitherto the largest and most stirring appear tame and orderly to their ampler largeness and stir. Here at last is something in the doings of man that corresponds with the broadcast doings of the day and night. Here is not merely a nation but a teeming nation of nations. Here is action untied from strings necessarily blind to particulars and details magnificently moving in vast masses. Here is the hospitality which forever indicates heroes . . . . Here are the roughs and beards and space and ruggedness and nonchalance that the soul loves. Here the performance disdaining the trivial unapproached in the tremendous audacity of its crowds and groupings and the push of its perspective spreads with crampless and flowing breadth and showers its prolific and splendid extravagance. One sees it must indeed own the riches of the summer and winter, and need never be bankrupt while corn grows from the ground or the orchards drop apples or the bays contain fish or men beget children upon women.