1. In 1883, the Brooklyn Bridge opened. This iconic piece of engineering was the longest suspension bridge in the world at the time of its completion and remains an important landmark in New York City today.

2. In 1900, the first modern subway system in the world began operating in New York City. The Interborough Rapid Transit Company (IRT) opened the first subway line, which ran from City Hall in Manhattan to 145th Street in Harlem.

3. On October 1, 1924, Yankee Stadium officially opened in the Bronx. It was the first stadium built specifically for the New York Yankees and was nicknamed "The House That Ruth Built" after the legendary Babe Ruth.

4. In 1949, Mao Zedong established the People's Republic of China in Beijing. This event sparked celebrations and protests in New York City's Chinatown, which has long been a hub for Chinese immigrants and their descendants.

5. On October 1, 2017, a gunman opened fire at a country music festival in Las Vegas, killing 58 people and injuring hundreds more. This tragic event had a profound impact on the nation and led to renewed calls for gun control measures in the United States.