1. In 1985, Microsoft Windows 1.0 was released.

On November 21, 1985, Microsoft Corporation released the first version of its revolutionary Windows operating system. Windows 1.0 featured a graphical user interface that made computers more accessible to non-technical users, paving the way for the widespread adoption of personal computers.

2. In 1922, the Lincoln Memorial in Washington, D.C. was dedicated.

On November 21, 1922, thousands of people gathered on the National Mall in Washington, D.C. to witness the dedication of the Lincoln Memorial, a massive structure built in honor of the 16th president of the United States. Today, the Lincoln Memorial is one of the most iconic landmarks in the city, attracting millions of visitors every year.

3. In 1959, the Mackinac Bridge in Michigan was opened.

On November 21, 1959, the Mackinac Bridge, a suspension bridge spanning the Straits of Mackinac in Michigan, opened to the public. At the time, the bridge was the longest suspension bridge in the world, and it remains a popular tourist attraction today.

4. In 1877, Thomas Edison announced the invention of the phonograph.

On November 21, 1877, Thomas Edison announced to the public that he had invented a device that could record and play back sound. The phonograph, as it came to be known, revolutionized the music industry and paved the way for modern audio recording technology.

5. In 1934, President Franklin D. Roosevelt signed the Indian Reorganization Act.

On November 21, 1934, President Franklin D. Roosevelt signed the Indian Reorganization Act, a piece of legislation that aimed to reverse the assimilationist policies of the federal government toward Native Americans. The act provided funding for tribal governments, encouraged the preservation of Native American culture and traditions, and gave tribes more control over their own affairs.