Under which circumstances might a U.S. president send federal soldiers to enforce order in a state?

a. if a state needed help in collecting income tax
b. if a state’s elected governor committed a crime
c. if a state collected tolls on an interstate highway
d. if a state’s police force could not keep the peace

The correct answer is d. if a state’s police force could not keep the peace.

The U.S. president can send federal soldiers to enforce order in a state under the following circumstances:

- If the state requests federal assistance to maintain law and order.
- If there is an insurrection or rebellion against the state government that hinders the execution of state law.
- If there is a federal court order that requires federal intervention to enforce the law.
- If there is a violation of federal law that requires federal intervention to enforce the law.

Sending federal soldiers to enforce order in a state is a serious decision that requires careful consideration of the circumstances and potential consequences.