Final answer:
The best title for the list is 'Buffalo Soldiers'.
Step-by-step explanation:
The "Buffalo Soldiers" were African American regiments in the U.S. Army, formed after the Civil War. They played crucial roles in the western frontier, participating in military campaigns, protecting settlers, and constructing infrastructure. The nickname "Buffalo Soldiers" was given by Native Americans, possibly due to the soldiers' hair resembling buffalo fur.
The mention of patrolling the frontier, recovering stolen livestock, and building roads and forts indicates that the individuals in this list were involved in maintaining law and order and protecting the frontier. The term 'Buffalo Soldiers' refers to the African American soldiers who served in the western frontier after the Civil War. They played a crucial role in patrolling and protecting the newly settled areas, including helping in recovering stolen livestock and building infrastructure.