1806 – Approaching the Colorado foothills of the Rocky Mountains during his second exploratory expedition, Lieutenant Zebulon Pike spots a distant mountain peak that looks “like a small blue cloud.” The mountain was later named Pike’s Peak in his honor.
1915 – On October 29, 1915, Jane Addams, a leading American social activist, writes to United States President Woodrow Wilson, warning him of the potential dangers of readying the country to enter the First World War.