Born in Massachusetts on July 11, 1767, John Quincy Adams was the eldest son of President John Adams and the sixth president of the United States. In his pre-presidential years, Adams was one of America's greatest diplomats (formulating, among other things, what became the Monroe Doctrine); in his post-presidential years, he conducted a consistent and often dramatic fight against the expansion of slavery. Though full of promise, his presidential years were difficult. He died in 1848 in Washington, D.C.