John Adams' (October 30 [O.S. October 19] 1735 – July 4, 1826) was the second president of the United States (1797–1801), having earlier served as the first vice president of the United States. An American Founding Father, Adams was a statesman, diplomat, and a leading advocate of American independence from Great Britain. Well educated, he was an Enlightenment political theorist who promoted republicanism, as well as a strong central government, and wrote prolifically about his often seminal ideas, both in published works and in letters to his wife and key adviser Abigail Adams, as well as to other Founding Fathers. Adams was a lifelong opponent of slavery, having never bought a slave. In 1770, he provided a principled, controversial, and successful legal defense to British soldiers, accused in the Boston Massacre because he believed in the right to counsel and the "protect[ion] of innocence."
Adams came to prominence in the early stages of the American Revolution. A lawyer and public figure in Boston, as a delegate from Massachusetts to the Continental Congress, he played a leading role in persuading Congress to declare independence. He assisted Thomas Jefferson in drafting the Declaration of Independence in 1776, and was its primary advocate in the Congress. Later, as a diplomat in Europe, he helped negotiate the eventual peace treaty with Great Britain, and was responsible for obtaining vital governmental loans from Amsterdam bankers. A political theorist and historian, Adams largely wrote the Massachusetts Constitution in 1780, which together with his earlier Thoughts on Government, influenced American political thought. One of his greatest roles was as a judge of character: in 1775, he nominated George Washington to be commander-in-chief, and 25 years later nominated John Marshall to be Chief Justice of the United States.