Final answer:
Washington's indigenous tribal governments can create their own laws and governments, own and operate casinos, contribute to the state's economy, and have sovereignty while still being subject to federal laws.
Step-by-step explanation:
Washington's indigenous tribal governments and economies possess several key characteristics. Firstly, they have the ability to create their own governments, allowing them to exercise self-governance and make decisions that affect their communities. Secondly, many tribes may own and operate casinos, which has become a significant source of revenue for them.
Additionally, tribal governments create their own laws, known as tribal laws, which are separate from state laws. They contribute to the state's economy through various means, including casino profits, providing employment opportunities, and participating in economic development projects. Lastly, although tribal governments have their own governance systems, they are still subject to federal laws.