This census-designated place first settled in 1623 is home to a defensive fortification built at the mouth of what river?
Fort McClary Fort McClary is a former defensive fortification of the United States military located along the southern coast of Maine at Kittery Point. Built at the mouth of the Piscataqua River, it was used primarily throughout the 19th century to protect approaches to the harbor of Portsmouth, New Hampshire, and the U.S. naval shipyard.
Fort Orleans Fort Orleans (sometimes referred to Fort D'Orleans) was a French fort in colonial North America, the first fort built by any European forces on the Missouri River. It was built near the mouth of the Grand River near present-day Brunswick. Intended to be the linchpin in the vast New France empire stretching from Montreal to New Mexico, the fort was occupied from 1723–1726. It was the first multi-year European settlement in what is today the U.S. state of Missouri.