In what way did the united states contribute to end world war i (check all that apply):

-they supplied the allies with weapons.
-the peace treaty, authored by representatives of the united states, was signed by -hungary and germany and immediately ended the war.
-prior to the war, u. s. forces trained france and russian troops to prepare for potential confrontations.
-u. s. troops aided the allied powers on the battlefield.
-u. s. citizens gave up food or gas to in the war effort.

These sentences are the involvement of the US in the World War I.

-The peace treaty, authored by representatives of the United States, was signed by Austria-Hungary and Germany and immediately ended the war.
 The statement above refers to the treaty of Versailles where Germany was forced to sign the treaty after losing from the Allied force

-U.S. troops aided the Allied Powers on the battlefield.
The US had sent the American Expeditionary Forces to aid the British and French Soldiers in the Dardanelles Strait. They were used as the second front lead by Pershing.
-U.S. citizens gave up food or gas to help in the war effort.
The government had encouraged the Americans to conserve and economize in order to help the American soldiers who are in the field.

The central idea is that the hiv/aids epidemic is serious.