What impact did sinclair‘s book have on the era of progressive reform

It was part of the muckraking trend in journalism and helped to keep that going. It also showed people how progressive activism could bring about change. Since, "The Jungle" did bring about reform by the Federal government.

Sinclair's book, which detailed the state inside meat processing factories in the US, led to massive public outcry, with people putting pressure on the government to regulate and restrict those awful practices.

each played a major role in ending the cold war.

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.