The american economy thrived because of federal involvement, not the lack of it. how did the federal government actively promote industrial and agricultural development in this period?.

The federal government thrived the economy by imposing high tariffs to favor national companies, create grants to convince railroad companies to build a railroad net, and by removing native American settlements so the farmers and miners didn't run risks.

Explanation:

First of all the U. s. the government carried on a nationalistic, expansionist strategy to thrive the economy. It imposed high tariffs on foreign companies so nationals were preferred over foreign ones. Also, because it created a land granting program to pay for the construction of a railroad net in species not in money. But also by erasing the native American settlements to profit their land. Thus, the reasons might not look as very complicated but the process of achieving them was really difficult, for example, the railroad companies didn't want to build a net, so they had to create a way to pay them for doing so.

The federal government actively promote industrial and agricultural development in this period by imposing high tariffs which prevented competition, granted land to Railroad companies, removed Indians for farmers and mining companies.

This all happened during the Gilded Age, which was from 1870s to about 1900.