| September | |
| 1 | Liberty Bell Arrives (1752) |
| 1 | Start of World War II (1939) |
| 2 | Japanese formal surrender, Japanese signed document aboard USS Missouri—end of World War II (1945) |
| 3 | Treaty of Paris signed—end of the Revolutionary War (1783) |
| 5 | The First Continental Congress (1774) |
| 8 | Pledge of Allegiance penned by Francis Juilius Bellamy (1892) |
| 10 | Signing of the Treaty of Saint-Germain (1919) |
| 11 | Patriot Day—Anniversary of 9/11 Attacks (2001), Moment of Silence at 8:46am |
| 14 | Star-Spangled Banner, composed by Francis Scott Key (1814) |
| 17 | Constitution Day—Ratification of the U.S. Constitution (1787) |
| 17-23 | Constitution Week |
| 18 | U.S. Air Force Established (1947) |
| 19 | National POW/MIA Recognition Day (1979) |
| 19 | Washington’s “Farewell Address” published (1796) |
| 22 | Emancipation Proclamation issued by President Lincoln (1862) |
| 28 | Battle of Yorktown begins (1781) |
| 28 | Gold Star Mothers’ Day |
| October | |
| 3 | Thanksgiving Day Proclamation (1863) |
| 7 | Battle of Kings Mountain (1780) |
| 10 | Battle of Point Pleasant (1774) |
| 11 | NSDAR Founder’s Day—Anniversary of founding of NSDAR (1890) |
| 13 (2025) | Congress established Continental Navy as US Navy (1775) |
| 13 | White House Cornerstone Laid (1792) |
| 19 | Columbus Day—Christopher Columbus arrived in the Americas (1492) |
| 19 | Surrender at Yorktown – 244th Anniversary of British surrender (1781) |
| 26 | Skirmish at Hampton – 250th Anniversary of the Battle (1775) |
| 26 | National Day of the Deployed |
| 27 | The first of 85 Federalist Papers Appeared In Print (1787) |
| 28 | The Cuban Missile Crisis Ends (1962) |
| November | |
| 2 (2025) | The first Thanksgiving celebrated at Berkeley Plantation (1619) |
| 4 (2025) | Election Day |
| 10 | Marine Corps Birthday |
| 11 | Veterans Day—honors all military veterans (1954) |
| 15 | Skirmish at Kemp’s Landing—Anniversary of the Battle (1775) |
| 27 (2025) | Thanksgiving Day |
| December | |
| 6 | Battle of Great Bridge—Anniversary of the Battle (1775) |
| 7 | Pearl Harbor – 83rd Anniversary of the “Date which will live in Infamy” (1941) |
| 9 | George Washington’s death—Anniversary of death (1799) |
| 14 | Treaty of Paris—Ending Spanish-American War (1898) |
| 15 | Bill of Rights Day – Anniversary of First 10 Amendments to the Constitution ratified (1791) |
| 18 | Anniversary of Mayflower landing at Plymouth Harbor (1620) |
| 19 | Valley Forge established (1777) |
| 25 | Christmas Day |
| January | |
| 17 | Battle of Monte Cassino during WWII (1944) |
| 19 (2026) | Dr. Martin Luther King Jr. Day |
| February | |
| 4 | George Washington elected President—anniversary of election (1789) |
| 18 | End of the War of 1812 (1815) |
| 16 (2026) | Presidents’ Day |
| March | |
| 3 | Star-Spangled Banner became the national anthem (1931) |
| 8 | First combat troops sent to South Vietnam (1965) |
| 15 | Battle at Guilford Courthouse (1781) |
| 29 | National Vietnam War Veterans Day (2017) |
| April | |
| 6 | U.S. entered World War I (1917) |
| 9 | Lee surrendered to Grant ending the Civil War (1865) |
| 12 | Civil War began with Fort Sumter attack (1861) |
| 19 | Battles of Lexington and Concord—start of the Revolutionary War (1775) |
| 22 | Earth Day |
| 26 | First Landing (1607) |
| May | |
| 7 | Germany surrendered – ended World War II in Europe (1945) |
| 12 | Florence Nightingale’s birth (1820) |
| 14 | Jamestown established (1607) |
| 16 (2026) | Armed Forces Day—Honors members currently serving in the military (1950) |
| 25 (2026) | Memorial Day – Remembers all those who have died while serving in the military (1868) |
| June | |
| 6 | D-Day (1944) |
| 14 | Flag Day—Adoption of the U.S. Flag (1777) |
| 14 | Army Birthday |
| 17 | Battle of Bunker Hill (1775) |
| 18 | Declaration of War against Britain (1812) |
| 19 | Juneteenth—end of slavery (1865) |
| 28 | Treaty of Versailles—ended World War I (1919) |
| July | |
| 2 | Knox-Porter Resolution Signed (1921) |
| 4 | Independence Day—Anniversary of Declaration of Independence (1776) |
| 5 | U.S. Secret Service Established (1865) |
| 7 | First Women Sworn in as FBI Members (1972) |
| 8-10 | Battle of Gwynn’s Island (1776) |
| 16 | First Atomic Bomb Test (1945) |
| 21 | U.S. Veterans Administration Created (1930) |
| 26 | U.S. Military Desegregation (1948) |
| 26 | National Security Act Signed (1947) |
| 27 | Korean War Armistice Signed (1953) |
| 29 | U.S. Army Chaplain Corps Birthday (1775) |
| August | |
| 2 | Gulf War Begins (1990) |
| 4 | Coast Guard Birthday (1790) |
| 4 | Proclamation of Neutrality (1914) |
| 7 | Purple Heart Day (1782) |
| 10 | Department of Defense Established (1949) |
| 14 | Victory over Japan Day (V-J Day) (1945) |
| 14 | Stamp Act Protest in Boston (1765) |
| 18 | Ratification of 19th Amendment, Women’s Right to Vote (1920) |
| 23 | Dolley Madison saves portrait of George Washington (1814) |
| 25 | National Park Service Established (1916) |
| 25 | Liberation of Paris (WWII) (1944) |
| 29 | United States Marine Corps Reserve established (1916) |