Answer:
Inclusive economic institutions
Step-by-step explanation:
Daron Acemoglu explains on his book titled 'Why Nations Fail' the roots and causes of economic development. For this author the most important component of progress is the stablishment of economic institutions which permits the integration and cooperation of society, defined by inslusive economic instituions instead of extractive ones.
In this particular case, the US autorities implemented a free market economy which correspond to an inclusive institution and replacing the old economy.