1. On April 10, 1865, Colorado Territory Governor John Evans issued a proclamation calling for 100-day volunteers to fight in the Civil War. Colorado contributed more than 4,000 soldiers to the Union army during the war.

2. In 1888, the Colorado Labor Wars began on April 10 when striking miners clashed with National Guard troops in Cripple Creek. The conflict lasted for several years and resulted in numerous deaths and injuries on both sides.

3. On April 10, 1909, the town of Summitville was destroyed by a fire caused by a gas explosion in a local mine. The blaze burned for days and destroyed nearly every building in the town, which was never rebuilt.

4. In 1912, the Titanic's unsinkable Molly Brown survived the infamous shipwreck on April 10. Brown, a Denver socialite and philanthropist, helped other passengers into lifeboats and later worked to raise funds for the survivors.

5. On April 10, 1963, the United States Postal Service issued a stamp commemorating the Colorado statehood centennial. The stamp, which featured a portrait of Colorado's first governor, Alexander Hunt, was part of a nationwide series of commemoratives.