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  1. 1902. January 13: The unification of Saudi Arabia begins. May 20: Cuba given independence by the United States. May 31: Second Boer War ends in British victory. July 12: Arthur Balfour becomes Prime Minister of the United Kingdom. July 17: Willis Carrier invents the first modern electrical air conditioning unit.

  2. 16 de jul. de 2019 · This century witnessed two world wars, the Great Depression of the 1930s, the Holocaust in Europe, the Cold War, revolutionary social equality movements, and the exploration of space. Follow the changes in this decade-by-decade timeline of the 20th century.