Answer:
D: a revolution in Russia
Explanation:
The Bolshevik Revolution in Russia, which led many to fear that immigrants, particularly from Russia, southern Europe, and eastern Europe, intended to overthrow the United States government; The end of World War I, which caused production needs to decline and unemployment to rise.
Most of the popular sports we play today are from Greek sports! Boxing back then is almost the same as now, they used a “punch-ball”. Some rules were Don’t use a ring and you don’t pick who you box with.
In 1917, Germany, determined to win its war of attrition against the Allies, announced the resumption of unrestricted warfare in war-zone waters. Three days later, the United States broke diplomatic relations with Germany, and just hours after that the American liner Housatonic was sunk by a German U-boat.