1. In 1850, the first public demonstration of telegraph transmission occurred in Washington, D.C. on December 28th. This event marked the beginning of a communication revolution that would ultimately lead to the internet and other forms of modern communication.

2. In 1892, the first electric streetcar in the U.S. debuted in the District of Columbia on December 28th. Known as the "Electric Cats," these streetcars were a significant advancement in public transportation and helped to shape D.C.'s cityscape.

3. On December 28, 1922, the Lincoln Memorial was dedicated in Washington, D.C. This iconic monument was built to honor the 16th President of the United States and has since become a symbol of the nation's history and spirit.

4. In 1973, the Endangered Species Act was signed into law on December 28th, providing federal protection for endangered species and their habitats. D.C. has played a significant role in the preservation of several species, including the bald eagle, which was once on the brink of extinction.

5. On December 28, 2009, the Metro crash in Washington, D.C. killed nine people and injured dozens more. This tragic event highlighted the need for increased safety measures on public transportation systems across the nation.