1. The Ludlow Massacre occurred on December 14, 1914, in southern Colorado. This tragic event involved a conflict between striking coal miners and the Colorado National Guard, resulting in the deaths of over 20 people, including women and children.

2. On December 14, 1787, the current United States Constitution was ratified by the state of Colorado. This document established the framework for the federal government and remains one of the most important legal documents in American history.

3. December 14, 1895 saw the founding of the state of Colorado's first public library in Denver. The Denver Public Library was established with a $2000 grant from philanthropist Andrew Carnegie and has since grown to become one of the largest and most respected library systems in the country.

4. In 1962, Denver International Airport opened its doors to travelers for the first time on December 14. This airport has since become one of the busiest airports in the United States, serving over 70 million passengers each year.

5. On December 14, 1992, the Denver Broncos defeated the Green Bay Packers in a thrilling overtime game. This victory clinched the AFC West title and helped set the stage for the Broncos' eventual Super Bowl victory the following year.