The Third Estate declared itself to be the National Assembly because they wanted the voting system to be fair and they would have the majority vote. When the king wanted the old ways, the third estate replied by making itself the National Assembly and drafted a new constitution. I hope I helped
Not sure if you still need this, but it is actually the last once, the Channel and Sea were barriers that made it impossible to get an invasion force to the Island without the RAF and the Royal Navy interfering
