All of Oliver North’s books are good. David McCullough “Adams” and my favorite is his “1776” as a first cousin 6 times removed was killed in the battle of Long Island.
Lincoln's War, by Geoffrey Perret
Ghost Soldiers.
I suggest:
It can’t happen here.
The Right Words - Great Republican Speeches That Shaped History, Wynton C. Hall
On My Honor - The Beliefs That Shaped My Life, John Ashcroft
“Colder Than Hell: A Marine Rifle Company at the Chosin Reservoir”- Joseph R. Owen
“To Rule the Waves: How the British Navy Shaped the Modern World”- Arthur Herman
“Dreadnought: Britain, Germany, and the Coming of the Great War”- Robert Massie
“Castles of Steel: Britain, Germany, and the Winning of the Great War at Sea”- Robert Massie
“The Rise and Fall of the Third Reich”- William Shirer
“The Second World War”- John Keegan
“Marlborough: His Life and Times”- Winston Churchill
A nice mix of war and politics, with emphasis on war.
Reagan's Secret War by Anderson and Anderson
Case Closed by Gerald Posner is a great one if you haven’t already read it. It’s about the JFK assassination and makes a powerful case that it was Oswald working alone.
And anything by Thomas Sowell is good of course. The one people usually recommend is Conflict of Visions but I like Quest for Cosmic Justice too.
April 1865
The Great Upheaval
Any book by Thomas Sowell. My favorite is Knowledge and Decisions. George Macdonald Fraser’s Quartered Safe Out Here is the best memoir I’ve ever read about WW II. Fraser wrote the Flashman novels. Quartered is about his experiences with Slim’s 14th Army in Burma. It is not to be missed. I also agree that Paul Johnson’s Modern Times is indispensible to an understanding of the 20th century and the state as the biggest killing machine in history. Oh, one other recommendation - Reflections on a Ravaged Century by Robert Conquest, simply magnificent.