The John Adams and John Quincy Adams Birthplaces are the oldest presidential birthplaces in the United States. John Adams was born in the salt box house located only 75 feet away from the birthplace of his son John Quincy Adams. Young John and his bride Abigail started their family, the future President launched his career in law and politics, and it was here that he, Samuel Adams and James Bowdoin wrote the Massachusetts Constitution. This document, still in use today, greatly influenced development of the United States Constitution.