1. On March 12, 1933, the Colorado River Compact was signed in Santa Fe, New Mexico, ending a decades-long conflict between seven states and Mexico over water rights. The compact allocated water from the Colorado River and its tributaries between the states, paving the way for development and growth in the western United States.

2. In 1950, the Colorado State Capitol Building was officially dedicated on March 12, after more than a decade of planning and construction. The building, which houses the offices of the governor and the legislature, features a distinctive gold dome and unique architecture that reflects Colorado's heritage and culture.

3. On March 12, 1965, the famous American singer and actor Elvis Presley held a concert at the Denver Coliseum, entertaining thousands of screaming fans. The concert was part of a tour that Presley embarked on after a hiatus from performing, and it cemented his status as a cultural icon.

4. In 1993, on March 12, a massive snowstorm swept across Colorado, dumping up to 34 inches of snow in some areas and causing widespread chaos and damage. The storm, which came to be known as the "Storm of the Century," paralyzed transportation and commerce in many parts of the state and caused at least 15 deaths.

5. On March 12, 2019, Colorado Governor Jared Polis signed a bill into law officially abolishing the death penalty in the state. Colorado became the 22nd state to repeal capital punishment, which had been on the books since the 1800s. The move was hailed as a victory for human rights and criminal justice reform advocates.