Question

Give reasons as to why was the national assembly formed by the third estates

Answer 1

* on 5 may 1789 louis 16 called an assembly of estates generals . voting for the estates general in the past were conducted for each state as whole
*the third estate demanded for individual votes 
* louis 16 refused to fullfill their demand
* as a result the people being annoyed ran out of meeting and declared themselves as national assemble
* on 20 june 1789 they locked themselves in the indoor tennis court and swore not to go out of it till the constitution is drafted

Answer 2

The national assembly was formed by the third estate because the people want to raise their voices for the injustice and to end the feudal system and also they want to make their own party for the right of the common people.