Just thought I'd start another collaborative thread.
Disclaimer:
I want this to be year-to-year, so please do not jump ahead and keep everything plausible. Thank you in advance.
Anyways, let's begin the thread:
July 2, 1776 (The POD):
The Continental Congress votes unanimously to pass the Lee Resolution, clearing the way to declare America's independence from Great Britain.
July 4, 1776:
The Declaration of Independence was signed, making this date the official birth of the United States of America.
Where American goes from here is completely up to you guys.
Enjoy!