What are examples of rationing during World War One

Every American was issued a series of ration books during the war. The ration books contained removable stamps good for certain rationed items, like sugar, meat, cooking oil, and canned goods. A person could not buy a rationed item without also giving the grocer the right ration stamp.

Explanation:

People were only allowed certain amounts of sugar, meat, flour, butter and milk. This was rationing. It made sure everyone in the country got what they needed.