Imperfect Union: How Jessie Fremont and John Fremont Mapped the West, Invented Celebrity, and Helped Cause the Civil War (2020) by Steve Inskeep

 A book about nineteenth century power couple, Jessie Fremont and John Fremont, by NPR reporter Steve Inskeep.  The writer is crisp and clear, unlike some academic history texts.  John Fremont comes off as unlikeable and kind of overblown but his wife is a heavy hitter.