Events January January 1 – Anastasio Somoza García becomes President of Nicaragua. January 5 – Water levels begin to rise in the Ohio River in the United States, leading to the Ohio River flood of 1937, which continues into February, leaving 1 million people homeless and 385 people dead. January 15 – Spanish Civil War: Second Battle of the Corunna Road ends inconclusively. January 20 – Second inauguration of Franklin D. Roosevelt: Franklin D. Roosevelt is sworn in for a second term as President of the United States. This is the first time that the United States presidential inauguration occurs on this date; the change is due to the ratification in 1933 of the Twentieth Amendment to the United States Constitution. January 23 – Moscow Trials: Trial of the Anti-Soviet Trotskyist Center – In the Soviet Union 17 leading Communists go on trial, accused of participating in a plot led by Leon Trotsky to overthrow Joseph Stalin's regime, and assassinate its leaders. February February 8 – Spanish Civil War: Falangist troops take Málaga. February 8 – February 27 – Spanish Civil War – Battle of Jarama: Nationalist and Republican troops fight to a stalemate. February 16 – Wallace H. Carothers receives a patent for nylon in the United States. February 19 Airliner VH-UHH (Stinson) goes down over Lamington National Park, bound for Sydney, killing 5 people. Yekatit 12: During a public ceremony at the Viceregal Palace (the former Imperial residence) in Addis Ababa, Ethiopia, two Eritrean nationalists attempt to kill viceroy Rodolfo Graziani with a number of grenades. Italian security guards fire into the crowd of Ethiopian onlookers. Authorities exact further reprisals, which include indiscriminately slaughtering native Ethiopians over the next 3 days, detaining thousands of Ethiopians at Danan and slaughtering almost 300 monks at the Debre Libanos Monastery. The flag of the Netherlands is officially adopted. February 20 – Roberto Ortiz is elected president of Argentina. February 21 – The League of Nations Non-Intervention Committee prohibits foreign nationals from fighting in the Spanish Civil War. February 25 – Hergé's Tintin adventure The Broken Ear (L'Oreille cassée) concludes serialization in the Belgian weekly newspaper supplement Le Petit Vingtième, and soon afterwards is published as a book in black and white. March March 10 (dated March 14 (Passion Sunday)) – The encyclical Mit brennender Sorge ("With burning concern") of Pope Pius XI is published in Germany in the German language. Largely