1) he helped us go through the Great Depression without him there would have been chaos
2) he helped us win WW2 and kept many Americans morale up
3) he didn't just talk, he acted on what he said
these all made him become one of the great presidents
The answer is, Peasant farmers made up the largest social class
The steps that countries must take to transition to a mixed-market economy are: they must establish a fair labor market, and they must open up trade to other countries.
A mixed economy is an economic system which mixes elements of market economies with elements of planned economies. It's a mixture of public and private enterprise.
So, to have a country with a mixed-market economy, countries must establish fair labor market to have adequate conditions for the labor market. Moreover, they must open up trade to other international countries. That is to say, to have free trade which doesn't restrict exports or imports.