What challenges did the United States face in the war in the Philippines?

The war was brutal on both sides. U.S. forces at times burned villages, implemented civilian reconcentration policies, and employed torture on suspected guerrillas, while Filipino fighters also tortured captured soldiers and terrorized civilians who cooperated with American forces.

this means that germany had to pay the allied countries. reparations are/is essentially payment for something that they have done wrong, so after ww1, germany was forced to pay reparations so they could replenish the allied countries resources' that they had lost during the war.