President Donald Trump speaks to the “Rx Drug Abuse and Heroin Summit,” Wednesday, April 24, 2019, in Atlanta. (AP Photo/Evan Vucci) ASSOCIATED PRESS Tim Carney begins his fascinating and challenging book Alienated America with Donald Trump’s campaign-launch pronouncement that, “Sadly, the American Dream is dead.” Carney marshals a wealth of evidence, both systematic and impressionistic, that confirms that for many Americans, this …