Answer: "The second federal armory and arsenal controlled by the government began to be built in Harpers Ferry in 1799".
Explanation: Harpers Ferry is a historic town in West Virginia. The number of inhabitants of this town in 2010 was 286. Moreover, the word "arsenal" makes reference to a building where different types of weapons and military equipment is kept. In 1799, years before the Civil War, the United States Armory and Arsenal began to be built at Harpers Ferry.