Which of the following are powers kept by the federal government under the federal system of government in the United States?
1. Print money
2. Declare war
3. Regulate international and interstate trade
4. Establish post offices and post roads
5. Establish a national armed forces
6. Establish and maintain a federal court system
7. Make treaties with other countries
8. Regulate immigration and naturalization
9. Coin money and regulate its value
10. Protect intellectual property rights
Please note that this list is not exhaustive, and there may be additional powers kept by the federal government under the federal system of government in the United States.