In the Civil War, Clara Barton traveled with the Union army to help the wounded.
Explanation:
In April 1861, Clara Barton created an agency to obtain and distribute supplies to wounded soldiers. General Hammond gave her permission to travel in the army ambulances to give comfort and treatment to the soldiers. In July 1862, she obtained permission to travel behind the battle line, reaching the hardest battlefields and serving during the sieges of Petersburg, Virginia, and Richmond, Virginia. In 1864, Union General Benjamin Butler named her manager of the hospitals in charge of the Union Army.
I think one of the reasons was because the US was helping Britain and France by producing weapons and supplies for them, which caused Germany to believe that this wasn’t neutrality.
