I'm also a history geek, my favorite topic is the Civil War. Right now I'm reading "Sword of Lincoln" about the Army of the Potomac.
That era is not my strongest suit.
The pre & post revolutionary period, especially after the Declaration of Independence,(the Articles of Confederation, and the campaign to ratify the Constitution) are of interest.
Washington and Hamilton (and yes, I was Hamilton before Hamilton was cool) are my favorite founders. With allowance for their politial genius, Jefferson, Madison, and Franklin, not so much.
British politial history and figures Pitt, Disraeli, Gladstone, Churchill, et. al.
TR, Coolidge, FDR, Eisenhower, the Kennedy clan, LBJ, RN, et. al. for 20th C. politial history & biography.
Still a student of domestic and foreign policy, though less so of p0litics, which used to be a favorite sport.