How did the United States make contributions to the war effort during World War I?

Deploying troops and supplies

Explanation:

The United States entered the WWI in the 6 of April of 1917 when declared the war to Germany and for this date they started drafting men for the war. 2 years after about 2 million of American soldiers have being deployed in France.

As the country declare war against Germany the preparation of labor and food became a priority for the government that taught people how to grow food in their own backyards and secure that labor was consistent to have enough supplies.