1. The first meeting of the Wyoming Territorial Legislature was held on October 9, 1869. This marked the formal organization of the territory following its creation by U.S. President Andrew Johnson in July of that year.

2. In 1953, the town of Thermopolis was hit by a devastating flood on October 9. The floodwaters destroyed homes, businesses, and infrastructure, causing significant damage to the community.

3. On October 9, 1911, the Wyoming state flag was adopted by the state legislature. The flag features a blue field with the state seal in the center, surrounded by a wreath of sagebrush and a red and white ribbon with the words "Equal Rights" inscribed.

4. The University of Wyoming was officially dedicated on October 9, 1887. The university was established as the flagship institution of the Wyoming Territory and has since become a leading research and teaching institution in the region.

5. Wyoming's first national monument, Devils Tower, was established by President Theodore Roosevelt on October 9, 1906. The natural wonder, located in the Black Hills region of northeastern Wyoming, is a towering rock formation that attracts thousands of visitors each year.