Its true that they never went to war without putting their helmets on
The French celebrate that day because it commemorates the Storming of the Bastille on July 14, 1789. It was a turning point of the French Revolution. Also, Fete de Federation was held on July 14,1790. It was a way to celebrate the constitutional monarchy in France.
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~Bob Ross™
The split into Sunni and Shia of the religion of Islam can traced back to the dispute over the question of Muhammad's successor. Thus, the answer is letter C. It was believed that the dispute emerged in 632 just after the death of the Prophet Muhammad.