Cause of Revolution
King George III lead into abyss (American Revolution) by two horses named "Obstinacy" and "Pride"
Ulster and the American Colonies were both dependent on Britain and both begrudged English efforts to govern and tax them. The Irish already had direct experience of oppression and refused to allow the same in America. America attempted to compromise with the British by sending the Olive Branch Petition, but King George III ripped it apart.
Thomas Polk, the great uncle of President James K. Polk, read the Mecklenburg (Irish settlement) Declaration in North Carolina in 1771 to express the Irish sentiment against the British.
"Resolved, that whosoever...countenanced the unchartered and dangerous invasion of our rights, as claimed by Great Britain, is an enemy to this county- to America- and to the inherent and inalienable rights of man." -Thomas Polk (Mecklenburg Declaration, 1775)
George Washington's adopted son, George Washington Parke Custis stated the importance of the Irish during the American Revolution:
"The aid we received from Irish...in the struggle for independence was essential to our ultimate success. In the War of Independence, Ireland supplied 100 men for every single man by any foreign nation. Let America bear eternal gratitude to Irishmen."
With all of the acts of taxation and the laws of prohibiting many actions, America took all it could. The Declaration of Independence was a warning to other countries that American was going to war with Britain because of misdeeds of George III.
Patrick Henry's Famous Speech
The famous words "Give me liberty or give me death!" ended Patrick Henry's speech with a lasting effect for centuries to come. The speech was given in Richmond, Virginia to enrage the crowd. Even though the man was of Scottish ancestry, Scot-Irish settlers agreed with his words.