1. Gunpowder Plot of 1689: On December 7, 1689, Maryland's colonial government was overthrown by a group of Protestants in what became known as the Gunpowder Plot. The conspirators, led by John Coode, accused the Catholic government of supporting the deposed King James II and attempted to seize power. The plot was successful and Protestant rule was established in Maryland until 1715.

2. The Great Fire of 1904: On December 7, 1904, a devastating fire swept through downtown Baltimore, destroying over 1,500 buildings and causing $125 million in damage (equivalent to over $3 billion today). The fire is considered one of the worst disasters in the city's history.

3. Maryland's Ratification of the U.S. Constitution: On December 7, 1787, Maryland became the seventh state to ratify the United States Constitution, which established the framework for the new federal government. Maryland's delegates had initially opposed the Constitution, but ultimately voted in favor after the addition of the Bill of Rights.

4. Attack on Pearl Harbor: On December 7, 1941, Japan launched a surprise attack on the United States naval base at Pearl Harbor, Hawaii. The attack resulted in the deaths of over 2,400 Americans and led to the United States' entry into World War II. Many Marylanders served in the war, including those who joined the newly-formed Women's Army Corps.

5. The End of the Concorde Era: On December 7, 2003, the Concorde's final flight landed at Dulles International Airport in Virginia, signaling the end of the era of supersonic passenger travel. The Concorde had briefly operated flights between Baltimore-Washington International Airport and London in the late 1970s, but noise pollution concerns led to the cancellation of the route.