The directory was unsuccessful and was eventually replaced because

None of the constitution had been created that outlined its authority, is the right answer.

Explanation:

The Directory was a committee of five-member that ruled France in the period between 2nd November 1795 (while it succeeded the Committee of Public Safety) until 9 November 1799, (at the time when Napoleon Bonaparte overthrew it). Napoleon replaced this Directory with the French Consulate. The main reason behind replacing this committee was that none of the constitutions had been drafted that describe its authority.

the process is called revolution because it was a process of great economic-social transformations that began in england in the xviii century.

the industrial mode of production spread throughout much of the northern hemisphere throughout the xix and early xx centuries.

the effect of this revolution was the distance between the countries, with respect to economic and political power.   after all, not all industrialized at the same time, remaining in the condition of suppliers of raw materials and agricultural products to the industrialized countries.

these differences mark to this day the nations of the world that are divided between developed and developing countries. one way to measure whether a country is advanced is to assess how industrialized it is.