Political science/recent U.S. history: What books or other resources are good for learning about the evolution of US policies that arose in response to 9/11, in particular the PATRIOT Act and the drone program, in an objective and comprehensive way? Obviously any academic or journalist will have their own perspective and that’s fine, but I want to avoid resources that are primarily partisan or activist in nature. I am particularly interested in how they changed in response to different presidential administrations.