April 4, 1968: Civil rights leader, MLK Jr. was shot to death at a hotel in Memphis. The official story was a single shot fired by James Earl Ray from 200 feet away at a nearby motel struck King in the neck. Photo: Ralph Abernathy, with Mrs. King and her children lead a massive march through through the streets of Memphis.
James K. Polk, our 11th President, returned the country to Jacksonian-Democratic rule. He is most famous for the Mexican War (of which Lincoln was an adamant critic) and his expansionist policy in general. For his biography, you'd be best served reading "A Country of Vast Designs" by Robert Merry.