Henry Spencer wrote:
One might as well wonder why Americans persist in celebrating on
the 4th of July, when the US realistically more-or-less completed
becoming a nation on, um, well, perhaps Oct. 18th, or June 21st,
or July 26th, or March 4th, or May 29th, or even Dec. 24th.

Because that's when the US officially declared independence from
Britain.

The ratification of the Constitution is irrelevant, as it's not the
document which established or named the United States. Neither is it
relevant when other countries recognized the US, or stopped fighting
against it.
--
Keith F. Lynch - http://keithlynch.net/
Please see http://keithlynch.net/email.html before emailing me.