The Illinois Constitution is the fundamental legal document that outlines the structure and function of the state government in Illinois. It establishes the rights of citizens and the responsibilities of government officials. The current version was adopted in 1970, replacing an earlier constitution from 1870. This constitution includes several articles that cover various aspects of governance, such as the legislative, executive, and judicial branches. It also addresses issues like taxation, education, and local government. Amendments can be made to the constitution, allowing it to evolve with the needs of the state's residents.