This is a usage of a reply postal card during the First World War.
An additional 1-cent stamp was added to make the 2-cent rate of the time.
Note that the card is cancelled by the American flag machine of the Stock Yards Station, Kansas City, Mo. Reply postal cards were sold as a pair. The mailer (usually a business) left the cards intact and sent out their request for information, or often, advertising. The receiver tore the cards apart, and mailed back the already stamped reply. If they did not want to respond, the sender lost the cost of the postage.
On the back of this card is a request for a donation from a country club. They want the golfers to take part in a tournament to raise funds for war charity work. The member who returned this card did not play in the tournament, but did donate.
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