• if a state needed help in collecting income tax

• if a state's elected governor committed a crime
• if a state collected tolls on an interstate highway
• if a state's police force could not keep the peace
Under which circumstances might a U.S. president send federal soldiers to enforce order in a state?

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

- If a state needed help in collecting income tax: This scenario would fall under the responsibility of the Internal Revenue Service (IRS), and federal soldiers may not be needed. However, if there was significant resistance or obstacles preventing the collection of income tax, the president might consider sending federal soldiers to ensure compliance.

- If a state's elected governor committed a crime: If a governor commits a crime, it is generally within the jurisdiction of state law enforcement agencies and the state judicial system to handle the situation. However, if the situation escalates or if there is an immediate threat to public safety, the president may choose to intervene by sending federal soldiers.

- If a state collected tolls on an interstate highway: Collecting tolls on an interstate highway is generally within the authority of state governments, as long as it adheres to federal regulations. However, if the collection of tolls becomes chaotic, violent, or poses a serious threat to interstate commerce, the president may deploy federal soldiers to restore order and ensure the smooth functioning of the highway.

- If a state's police force could not keep the peace: It is the responsibility of state and local police forces to maintain law and order within their jurisdictions. However, if a state's police force is overwhelmed, unable to control a situation, or if there is a breakdown of law enforcement, the president may send federal soldiers to restore peace and ensure public safety. Additionally, if the situation involves a threat to federal property or federal interests, the president may use federal soldiers to intervene.