What is the golden age at least two sentences

Both in East and West, the 4th and 5th centuries form the golden age of dogmatic theology, a homiletic preaching of exposition, of letter writing, of church history, of religious poetry.

(Not my work) Progressive America was a turbulent world in which greed and corruption ruled. In this context many middle-class reformers came together to make the US a better place. While many historians would argue that the Progressive Movement was highly successful in combating the injustices of their time, the evidence will demonstrate that they fell short of meeting their own reform goals.