Short answers, pulled from the story.
Morristown earned the title because George Washington and the Continental Army encamped there twice during the Revolutionary War, in 1777 and again from December 1779 to June 1780. The town's location between Philadelphia and New York, its protection by the Watchung Mountains, and its local industries and resources made it a strategic base for the army.
During the first encampment in 1777, Washington's headquarters was Jacob Arnold's Tavern at the Morristown Green. During the second encampment from December 1779 to June 1780, he headquartered at the Ford Mansion, a large residence near the edge of town, where Ford's widow shared the house with Martha Washington and the army's officers.
The telegraph was first demonstrated at the Speedwell Ironworks in Morristown, New Jersey on the 6th of January, 1838, by Samuel F. B. Morse and Alfred Vail. The first message sent was "A patient waiter is no loser," and the first public demonstration followed five days later.
Morristown's Gilded Age lasted from roughly 1880 to 1929, during which dozens of wealthy New Yorkers built large estates in the area. By 1896, an estimated 54 millionaires lived there with a combined wealth of approximately $289,000,000, prompting the New York Herald in 1902 to call it "the Millionaire City of the Nation." The era ended in 1929 due to the high cost of maintaining estates, rising income taxes, and the stock market crash.
The Seeing Eye is the first school in North America to train guide dogs and pair them with blind and visually impaired students. Founded by Dorothy Harrison Eustis, it has trained more than 16,000 guide dogs on the streets of Morristown since 1929.
Morristown National Historical Park is the first National Historical Park established in the United States. It encompasses four historic sites associated with the American Revolutionary War, including Jockey Hollow, the Ford Mansion (Washington's headquarters during the 1779-80 encampment), and Fort Nonsense, all managed by the National Park Service.