Since the USA declared war on Germany it has been struggling to build a large army that can take on the Germans in France. Conscription has been introduced, so now men are being compelled to take part in the war whether they want to or not. This is not a development greeted with universal enthusiasm.
While some go on the run to avoid the draft, a group of farmers and rural folk in Oklahoma go considerably further. Motivated by anti-war sentiment and fear of the effects of conscription on their families’ livelihoods, several hundred (perhaps a thousand) of these anti-conscription activists come together and resolve to bring an end to the war. They stage a rebellion, planning a march on Washington where, joined by similar groups from across the country, they will overthrow Wilson and take America out of the war. On the way they will live off the land, roasting green corn, thereby giving their rebellion its name.
The Green Corn Rebellion proves to be short-lived. More law-abiding elements in Oklahoma quickly form a militia and face down the rebels. After a few shots are fired (killing three) the rebellion breaks. The authorities carry out mass arrests and prepare to send the rebels for trial. They also prepare to crack down on the various socialist and anarchist groups seen as being behind the unrest.
Anti-war poster (Jane Little Bodkin: Frank Little and the IWW)