A lawyer and political activist prior to the revolution, Adams was devoted to the right to counsel and presumption of innocence. He defied anti-British sentiment and successfully defended British soldiers against murder charges arising from the Boston Massacre. Adams was a Massachusetts delegate to the Continental Congress and became a principal leader of the Revolution. He assisted in drafting the Declaration of Independence in 1776 and was its foremost advocate in Congress. As a diplomat in Europe, he helped negotiate the peace treaty with Great Britain and secured vital governmental loans. Adams was the primary author of the Massachusetts Constitution in 1780, which influenced the United States’ own constitution, as did his earlier Thoughts on Government.