Generally, how did gov’t help business, what "ism" is it called, AND specifically list the gov’t help.

By not regulating the market and tax reduction

Explanation:

The government helped businesses by not enforcing much regulation on them. They allowed the marketers decide some actions for the market. These helped businesses to thrive, also they considered tax reduction, which businesses we're just to revert a very little portion of their earnings helping them have much more for their other business transactions. It is called the laissez faire capitalism

after the roman empire, the catholic church began to unify by taking on many duties of a government.