Final answer:
The Freedmen's Hospital in D.C. continued to function after the Freedmen's Bureau ended in 1872, but the provided information does not specify the exact year it stopped serving as the main medical facility.
Step-by-step explanation:
The second permanent hospital referred to in your question is likely the Freedmen's Hospital, which was established in Washington, D.C. Although the Freedmen's Bureau, which set up hospitals in various states, ended in 1872, the Freedmen's Hospital in D.C. remained operational. This hospital was part of a critical network providing care to many who had never before received professional medical treatment, and after the Bureau ended, only the Freedmen's Hospital in D.C. remained open. Unfortunately, the information provided does not specify the exact year until which the Freedmen's Hospital served as the main medical facility. However, it is known that the Canadian military medical services and hospitals, which were established around World War I, reverted to prewar status after the war ended, and the Royal Canadian Army then had a permanent medical component.
The second permanent hospital was originally known as the "Contraband Hospital" in Washington, D.C. It was part of a refugee camp established by the Union Army during the Civil War. After the camp closed in December 1863, the hospital continued to operate, eventually becoming known as the Freedmen's Hospital. It served as the main medical facility for the Postal Service until 1872, when the Freedmen's Bureau ended. Therefore, the hospital served as the Postal Service's main medical facility until 1872.