The third estate, along with a few members of the other estates, created the national assembly as a response to King Louis 16 locking them out of the meeting hall, after which, they met in the royal tennis court and took the Tennis Court Oath, swearing not to leave until a constitution outlining their demands to the King was created.
I got this from www.answers.com/Q/Why_did_the_third_estate_create_the_national_assembl
So please don't use this if its for an essay.
