1. In 1908, the small town of Helena in Montana became the first city in the world to have a public smoke-free zone. The ban on smoking in public places was enacted to combat tuberculosis, which was a major health crisis at the time.

2. On May 30, 1864, the Battle of Whitestone Hill occurred in southeastern North Dakota. The battle was between the U.S. Army and the Dakota Sioux, with the latter suffering a significant defeat. Many of the Native Americans who participated in the battle later fled to Montana.

3. Montana's Glacier National Park was established on May 30, 1910. The park covers over one million acres and is home to a diverse range of wildlife, including grizzly bears, wolves, and mountain goats.

4. American explorers Meriwether Lewis and William Clark passed through what is now Montana on May 30, 1805, during their famous expedition. They were the first non-Native Americans to explore the area and created detailed maps of the region.

5. In 1932, aviator Amelia Earhart became the first woman to make a solo nonstop flight across the Atlantic Ocean. Her journey began on May 20 and ended on May 30, when she landed in a pasture in Londonderry, Northern Ireland. Earhart inspired many in Montana and across the world with her determination and bravery.