1. January 19, 1865 - The Battle of the Tongue River: The Battle of the Tongue River was fought between the United States Army and a group of Native American tribes called the Sioux, Cheyenne, and Arapaho. The battle was part of the Indian Wars and took place in present-day Montana. The battle was the culmination of a campaign led by General Patrick Edward Connor, who was tasked with protecting the Bozeman Trail.

2. January 19, 1915 - The Anaconda Road Law: The Anaconda Road Law was passed by the Montana legislature on January 19, 1915. The law required all county road work be done under contract, rather than being done by county employees. The Anaconda Company, a mining company that dominated Montana's economy at the time, lobbied for the bill's passage because it wanted to control road construction in the state.

3. January 19, 1925 - The Colstrip Coal Strike: The Colstrip Coal Strike was a labor strike that began on January 19, 1925, at a coal mine in Colstrip, Montana. The strike was led by the Industrial Workers of the World (IWW) and was one of the most significant labor strikes in Montana's history. The strike lasted for six months, and during that time, the IWW established a tent city near the mine where the striking workers and their families lived.

4. January 19, 1943 - The Unveiling of the Montana State Capitol Building: The current Montana State Capitol Building was unveiled on January 19, 1943. The building was designed by Charles E. Bell, a Montana architect. The building's construction was delayed due to World War II, and the unveiling was a significant event in Montana's history.

5. January 19, 1971 - Colleen Renko Becomes Montana's First Female State Senator: On January 19, 1971, Colleen Renko became Montana's first female state senator. She was elected to represent Great Falls, Montana, and served in the state senate until 1975. Renko was a trailblazer for women in politics in Montana and paved the way for other women to run for office in the state.