Why was liberty, equality, and fraternity an idea of the Pre/French Revolution? How did it become an idea?

They did not favor the monarchy, Marie Antoinette and King Louis, (the last to rule into a monarchy) were thought to be selfish people. The town's people went into rage because they had no food. From what I remember, the bourgeoisie, a group that was formed convinced the townspeople that royalty is bad. Then executions happened.

The three ideals: freedom, equality and brotherhood were the foundation of the 'new France' that the revolutionaries sought. "Or death" was added from 1793, with the full motto often painted on house doors in Paris. Whether "and", or, "or", this part of the motto demonstrated the resolve of the revolutionaries.

(i recommend the first one)

Liberty, equality, brotherhood! Anyone knows that trio as the ideas behind the French Revolution! The rich were getting richer, the poor were getting poor, and the monarchy was not doing its duty and wasting resources and money. by 1789 they were bankrupt, mainly due to their aid to the American Revolution