The true statements are:
- The Constitution establishes a federal system of government.
- Power is divided between the central government and the states.
- Some powers are shared by the federal government and the states.
The statements "States possess the expressed powers detailed in the Constitution" and "States do not share powers with the federal government" are false. The expressed powers are specifically granted to the federal government, while states have their own reserved powers and can share some concurrent powers with the federal government.