The twelve months of 1920 ended up being memorable for a variety of situations. In that year, the Mexican Revolution happened and by the end of 1920 there was a big change of govt and there was also the Irish war of independence. During the year there was many local regional battles and skirmishes within Europe after the end of World War 1. The Treaty of Versailles which terminated that war becomes effective on January the 10th, formally ending World War I. Nonetheless, on March 19th the United States Senate declined to ratify the Treaty of Versailles. On January 16, The League of Nations Covenant comes into force with the institution holding their very first council assembly in Paris, France. Other battles during 1920 involved the Palestine riots on April the 4th with physical violence erupting among Arab and Jewish inhabitants in Jerusalem where nine were killed as well as 216 wounded. There ended up being a bombing in Wall Street in New York using a explosive device in a horse wagon exploding in front of the JP Morgan Building, murdering 38 and wounding 400. In February Adolf Hitler presented his National Socialist Program in Munich to the German Workers' Party which renames themselves as the Nazi Party. On September the 29th, Adolf Hitler makes his initial public appearance in Austria, with speeches in Vienna, Innsbruck along with Salzburg.
There was quite a few natural disasters through 1920 which included on February 20, an earthquake affects Gori in the Democratic Republic of Georgia causing the loss of 114 people. On January 3rd the Xalapa quake in Mexico will kill around 600 individuals, making it the second most serious earthquake in Mexico’s record. On March 28th, the Palm Sunday tornado outbreak strikes the Great Lakes area and the Deep South of the United States leading to quite a few deaths, injury, and much property damage. On December 17th the Mendoza earthquake of magnitude 6.0 resulted in the deaths of around 200 persons in Mendoza Province, Argentina.
Additional significant events during 1920 involved the conclusion to the Spanish Flu pandemic with an approximated 17 to 50 million deaths. This has been the final worldwide pandemic before the 2009 swine flu pandemic which occurs nearly ninety years afterwards. During August the 1920 Summer Olympics took place in Antwerp, Belgium. This was the very first Olympics which the designs of 5 interlock coloured circles and the connected flag were shown for the very first time. It became the well-recognised token of the Olympic community. On May 16 above 30,000 individuals came to a ritual in Rome for the Canonization of Joan of Arc which included 140 descendants of Joan of Arc's relatives. Pope Benedict XV presided during the rite, that the inside of Saint. Peter's Basilica in Rome is elegantly furnished for the celebration. In late July and early August the initial ever World Scout Jamboree is held in Olympia, in London. On October 31st, Dr. Frederick Banting of Canada 1st records in his notes his insight concerning how to isolate insulin for managing diabetes. It was not until two years later on that the very first successful human test of insulin occured.