1. In 1864, the Idaho Territory was officially organized by the U.S. government. This marked the beginning of an era in which Idaho would become a part of the expanding western frontier of the United States.

2. In 1882, the Northern Pacific Railroad reached Idaho, bringing with it a surge of growth and economic development. The railroad was instrumental in opening up the state to commerce and connecting it with the rest of the western United States.

3. In 1905, the Idaho State Capitol building was completed in Boise, serving as the seat of government for the state ever since. The building is an iconic symbol of Idaho's history and legacy, and it remains an important landmark of the state to this day.

4. In 1980, the Idaho State Historical Society was established, providing an ongoing framework for preserving and promoting the state's rich history and culture. The society has been instrumental in promoting historical research, preservation, and education in Idaho over the years.

5. In 2018, Idaho celebrated the 100th anniversary of the end of World War I. The state observed the occasion with a series of commemorative events and exhibits, highlighting the contributions and sacrifices of Idahoans during the great conflict. The anniversary served as a reminder of the important role that Idaho has played in American history and its ongoing commitment to patriotism and service.