Tonight’s new episode is called “The State of the Union Is Not Good” – and packs together a series of crises in the Seventies to show why that decade was so tumultuous. Indeed it was. But even with the respective meltdowns of Watergate and Three Mile Island, the decade that takes bragging rights for that remains the Sixties. And that goes not only for the 1960s, but the 1860s as well. I’ve just saying…