1. In 1783, the Annapolis Convention concluded its three-day meeting, during which delegates from five states met to discuss issues related to commerce and trade. This event marked an important step towards the creation of a federal government in the United States.

2. On December 5, 1833, Maryland's first railroad opened between Baltimore and Elliott's Mills, a distance of about 13 miles. The railroad was an innovative solution to transportation challenges faced in the state, and it would help to fuel Maryland's economic growth throughout the 19th century.

3. In 1864, during the Civil War, Confederate forces under General Jubal Early launched an unsuccessful attack on Fort Stevens outside of Washington, D.C. Despite the relatively low casualties on both sides, the attack was an important moment in the conflict, further demonstrating the resolve of Union forces.

4. On December 5, 1933, Prohibition was officially repealed in Maryland. This momentous event marked the end of a nationwide ban on alcohol that had been in effect since 1920, and it ushered in a new era of social and economic activity in the state.

5. In 1972, the United States Environmental Protection Agency (EPA) designated the Chesapeake Bay as an "estuary of national significance," recognizing its ecological importance and the need for coordinated efforts to protect it. Today, the Chesapeake Bay remains a vital natural resource for Maryland and the wider region.