November 10, 1775, was the day the Continental Congress passed funding for two marine landing battalions, the "Marines." The recruitment center setup in Philadelphia brought in men to join the secessionists, defending the people against the central government they no longer wanted.
The "birthday" was the year before the Declaration of Independence formally announced to the King and the world the 13 Colonies were now 13 independent States. "They" were separated from the "State of England".
The Marines were formed to fight the government. The purpose of the Marines "born" that November 10 was to help kick the government out. The Marines were the amphibious assault group in the effort for each State to become its own independent sovereign, breaking political ties with the tyrannical King and the State of England. The Marines who joined were British citizens pledging to fight the government.
At the time, these United States, or united states (lowercase "u"), were independent states in a mutual defense pact. The Articles of Confederation was their agreement. The Continental Congress was the assembly of the loosely connected union, calling for funding from each for the Marines and other mutual defense purposes.
The Marines assisted in the secession effort from their first amphibious raid on the government in March 1776 through the Treaty of Paris in 1783. The Treaty of Paris (1783) finalized the agreement that each of the American States was now independent of England. The treaty was with each of "them," the 13 sovereign States. Them, these, they.
"His Brittanic Majesty acknowledges the said United States, viz., New Hampshire, Massachusetts Bay, Rhode Island and Providence Plantations, Connecticut, New York, New Jersey, Pennsylvania, Delaware, Maryland, Virginia, North Carolina, South Carolina and Georgia, to be free sovereign and Independent States; that he treats with them as such." —Treaty of Paris.
With the war over and the Treaty of Paris in effect, in 1783, the Navy ships were sold and the Marines disbanded. There was no general government of the United States in today's form yet created to keep a Navy and Marines. The need was over. Standing armies were the opposite of what the Founders wanted and, as such, are proven dangers to liberty.
The Marine's official "birthday" was 13 years before the formation of the United States with the ratification of the U.S. Constitution by the ninth State to join, New Hampshire. The U.S. federal government was created in 1788 by the States via the Constitution, written in 1787. It took effect on June 21, 1788, after the minimum nine ratifications mark was reached.
In 1798, ten years after the general government we know of as The United States was created, the U.S. established the Marines on July 11, 1798. The U.S. Marines then took part in action against the Barbary Pirates and in the War of 1812.
One might ask a valid question on how can the United States Marines have a "birthday" 13 years before the States created the U.S. government and delegated it a power to create a marine force. One might wonder how the birthday can be 23 years before the United States general government established the Marines.
But the official birthday is November 10, honoring the creation of the secessionist volunteer marine expeditionary force. It's a secession holiday.
Celebrate the November 10 birthday for what it is. Honor the courageous Marines for what they did—helped get rid of the tyrannical central government ruling over these United States. Celebrate the secession the Marines were a key part of.
Happy Birthday to the Marines!