The Declaration of Independence: A Study in the History of Political Ideas (1922)
“"Nothing important happened today." - King George's diary entry, July 4th, 1776, the same day the American colonies declared their independence.”
Arnold Hunt, curator at the British Library, says King George never kept a diary http://www.npr.org/templates/story/story.php?storyId=11703583.
Misattributed
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George III of the United Kingdom 10
King of Great Britain and King of Ireland 1738–1820Related quotes

At a joint Anglo-American rally in Westminster, July 4, 1918, speaking against calls for a negotiated truce with Germany. As printed in War aims & peace ideals: selections in prose & verse (1919), edited by Tucker Brooke & Henry Seidel Canby, Yale University Press, p. 138.
Early career years (1898–1929)

1850s, What to the Slave is the Fourth of July? (1852)
Context: What, to the American slave, is your 4th of July? I answer: a day that reveals to him, more than all other days in the year, the gross injustice and cruelty to which he is the constant victim. To him, your celebration is a sham; your boasted liberty, an unholy license; your national greatness, swelling vanity; your sounds of rejoicing are empty and heartless; your denunciations of tyrants, brass fronted impudence; your shouts of liberty and equality, hollow mockery; your prayers and hymns, your sermons and thanksgivings, with all your religious parade, and solemnity, are, to him, mere bombast, fraud, deception, impiety, and hypocrisy — a thin veil to cover up crimes which would disgrace a nation of savages. There is not a nation on the earth guilty of practices, more shocking and bloody, than are the people of these United States, at this very hour.

Douglass here quotes William Lloyd Garrison, who famously declared in the first issue of The Liberator: "I am in earnest — I will not equivocate — I will not excuse — I will not retreat a single inch — AND I WILL BE HEARD."
1850s, What to the Slave is the Fourth of July? (1852)
Context: I shall see, this day, and its popular characteristics, from the slave's point of view. Standing, there, identified with the American bondman, making his wrongs mine, I do not hesitate to declare, with all my soul, that the character and conduct of this nation never looked blacker to me than on this 4th of July! Whether we turn to the declarations of the past, or to the professions of the present, the conduct of the nation seems equally hideous and revolting. America is false to the past, false to the present, and solemnly binds herself to be false to the future. Standing with God and the crushed and bleeding slave on this occasion, I will, in the name of humanity which is outraged, in the name of liberty which is fettered, in the name of the constitution and the Bible, which are disregarded and trampled upon, dare to call in question and to denounce, with all the emphasis I can command, everything that serves to perpetuate slavery — the great sin and shame of America! "I will not equivocate; I will not excuse;" I will use the severest language I can command; and yet not one word shall escape me that any man, whose judgement is not blinded by prejudice, or who is not at heart a slaveholder, shall not confess to be right and just.

1950s, Address at the Philadelphia Convention Hall (1956)

“Nothing important happened today.”
It is widely believed that George III wrote this in his diary on July 4, 1776, the day the American Revolution began. In fact, this was made up by the scriptwriters of the series The X Files, as George III did not write a diary.
Misattributed

2000s, The Real Abraham Lincoln: A Debate (2002), Q&A
FOREWORD, p. v.
The Ideological Origins of the American Revolution (1967)