The series is set in New York State in the years following the financial disaster of 1929, this one is in the summer of 1932.
There are a couple of decent mysteries going on, and the depiction of the difficulties faced by law enforcement of the time should serve as reminders of how far we've come in that regard.
For me, the most notable segments dealt with the Bonus Army and the March on Washington. The basis was the legal promise made to the veterans of WWI to pay a financial bonus to each of them in 1945. As the country was deep into a depression and people were without jobs or resources, they needed the money now, but Hoover had his head in the sand and not only denied them the money, but denied that the country really was in need. When men and families were so desperate that they camped out in tents and packing crates across from the senate, at one point Hoover sent MacArthur, Eisenhower, and Patton on horseback with drawn swords and tear gas to remove the children, women, and men, many of whom had nowhere to go due to foreclosures.
The historical facts check out, but are presented in the context of fictional persons.