The us federal reserve strengthen the economy when it controls the supply of money, the availability of credit, and

The correct answer is: "the interest rates".

Central banks, such as the Federal Reserve, are in charge of designing and applying the monetary policy, which consists on influencing the amount of money in circulation in the economy and the interest rate levels, through mechanisms such as the open market operations.

These two factors allow to determine the availability of credit in the economy and its investment levels, which in turn determine GDP figures and economic growth levels. The main objectives of the monetary policy are to ensure high economic growth, high employment levels and price stability (low inflation).

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.