Charles Carroll of Carrollton was the wealthiest man in the American colonies at the time of the Revolution. He was the only Catholic to sign the Declaration of Independence, and after a long and distinguished career in public service, he was the last of the signers to die. Despite laws outlawing Catholics from holding public office in the Maryland colony he was elected as a delegate to the Continental Congress. He later served as a U.S. Senator from Maryland, and helped to write the Constitution for the new State of Maryland. He served on the board of the Baltimore & Ohio Railroad and laid the cornerstone for its construction.