World War I affected those on the home front as they faced scarcity of food in America. All the packed food was sent to Europe for soldiers fighting in the war.
World War I
During WWI, many packed and canned food were sent to Europe.
The supply of food in Europe created a scarcity in America's home front as they were not able to get the amount of food they needed.
To overcome the scarcity of food, the government introduced ration cards.
The government also encouraged to grow their vegetables in the back garden and to consume less canned food.
Thus option D is the correct answer.
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