State and local governments have evolved significantly over time. States were originally sovereign entities that came together in a loose confederation, then formed a stronger federal union. States create and determine the powers of local governments. More recently, states and localities have taken on more responsibilities from the federal government. State governments are primarily responsible for education, health, transportation, economic development, and criminal justice. They rely mainly on income and sales taxes for revenue. Local governments focus on areas like public safety and rely heavily on property taxes. Relations with Native American tribes also impact state and local authorities.