10 Days That Changed History

NYT Magazine has a parlour game for us historians. Apparently, history happens when nobody is watching [does that really cement the"end of history" for us, as we live in the Age of Watchers?]. Regardless, Adam Goodheart at Washington College says that the"10 days that follow — obscure as some are — changed American history. (In some cases, they are notable for what didn't happen rather than what did.)" :

• JUNE 8, 1610: A Lord's Landfall:"A fleet coming toward them, carrying a new governor, Lord De La Warr, and a year's worth of supplies. If not for his appearance, Virginia might have gone the way of so many lost colonies"
  
• OCT. 17, 1777: Victory Along the Hudson:"It is when the British general John Burgoyne surrendered at Saratoga."
  
• JUNE 20, 1790: Jefferson's Dinner Party:"Had that meal never taken place, New York might still be the nation's capital. But even more important, the primacy of the central government might never have been established"
  
• APRIL 19, 1802: Mosquitos Win the West:"On April 19, Leclerc reported to Napoleon that the rainy season had arrived, and his troops were falling ill. By the end of the year, almost the whole French force, including Leclerc himself, were dead of mosquito-borne yellow fever."
  
• JAN. 12, 1848: An Ill-Advised Speech:"Lincoln's early faux pas also taught him to be a pragmatist, not just a moralist."
  
• APRIL 16, 1902: The Movies:"Thomas L. Tally opened his Electric Theater in Los Angeles, a radical new venture devoted to movies and other high-tech devices of the era, like audio recordings."
  
• FEB. 15, 1933: The Wobbly Chair:"Giuseppe Zangara, an anarchist, lost his balance atop a wobbly chair, and instead of hitting President-elect Franklin D. Roosevelt, he fatally wounded the mayor of Chicago, who was shaking hands with F.D.R."
  
• MARCH 2, 1955: Almost a Heroine:"Claudette Colvin, 15, seemed poised to become an icon of the struggle against segregation. But then, shortly after her March 2 arrest, she became pregnant"
  
• SEPT. 18, 1957: Revolt of the Nerds:"the birth date of Silicon Valley, of the electronics industry and of the entire digital age"
  
• AUG. 20, 1998: Just Missed:"when the United States fired some 60 cruise missiles at Qaeda training camps in Afghanistan"
  

Well? Can we add/dispute the 10 days that changed _american_history?
ps: no 9/11 there.