1. Idaho Territory Established - On June 28, 1863, Idaho Territory was established by President Abraham Lincoln. The territory included all of present-day Idaho, Montana, and Wyoming, as well as parts of Nevada, Utah, and Oregon.

2. Idaho Becomes a State - On June 28, 1890, Idaho became the 43rd state in the United States. It was the third of four states added to the Union that year, after North Dakota and South Dakota, and before Wyoming.

3. Blackfoot Dam Completed - On June 28, 1927, the Blackfoot Dam in southeastern Idaho was completed. The dam, which is 97 feet high and 870 feet long, is used to generate hydroelectric power and to irrigate nearby farmland.

4. Sawtooth National Recreation Area Established - On June 28, 1972, the Sawtooth National Recreation Area was established in central Idaho. The area encompasses more than 750,000 acres of rugged mountains, lakes, and streams, and is a popular destination for outdoor enthusiasts.

5. Gerald F. Vandeberg - On June 28, 1998, Gerald F. Vandeberg became the first person to complete a solo swim across Bear Lake in eastern Idaho. The swim covered a distance of more than 20 miles and took Vandeberg more than 11 hours to complete.