Select the ways that the national guard is used. to protect american rivers to preserve law and order to assist in emergencies to patrol and protect the congress to do conservation work to supplement the army in war

To preserve law and order.

To assist in emergencies.

To supplement the army in war.

Explanation:

These are all ways in which the United States National Guard is used. The National Guard is part of the reserve of the United States Armed Forces. As such, the members of the National Guard are also members of the militia of the United States. The National Guard is made up of 54 separate organizations, and is under the control of both the state and the federal government.