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  1. As the head of the government of the United States, the president is arguably the most powerful government official in the world. The president is elected to a four-year term via an electoral college system. Since the Twenty-second Amendment was adopted in 1951, the American presidency has been.

    • The Editors of Encyclopaedia Britannica
    • Overview
    • The outbreak of war

    World War I began after the assassination of Austrian archduke Franz Ferdinand by South Slav nationalist Gavrilo Princip on June 28, 1914.

    Read more below: The outbreak of war

    Balkan Wars

    Read more about why the Balkans became the “powder keg of Europe.”

    What countries fought in World War I?

    The war pitted the Central Powers (mainly Germany, Austria-Hungary, and Turkey) against the Allies (mainly France, Great Britain, Russia, Italy, Japan, and, from 1917, the United States).

    With Serbia already much aggrandized by the two Balkan Wars (1912–13, 1913), Serbian nationalists turned their attention back to the idea of “liberating” the South Slavs of Austria-Hungary. Colonel Dragutin Dimitrijević, head of Serbia’s military intelligence, was also, under the alias “Apis,” head of the secret society Union or Death, pledged to the pursuit of this pan-Serbian ambition. Believing that the Serbs’ cause would be served by the death of the Austrian archduke Franz Ferdinand, heir presumptive to the Austrian emperor Franz Joseph, and learning that the Archduke was about to visit Bosnia on a tour of military inspection, Apis plotted his assassination. Nikola Pašić, the Serbian prime minister and an enemy of Apis, heard of the plot and warned the Austrian government of it, but his message was too cautiously worded to be understood.

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    At 11:15 am on June 28, 1914, in the Bosnian capital, Sarajevo, Franz Ferdinand and his morganatic wife, Sophie, duchess of Hohenberg, were shot dead by a Bosnian Serb, Gavrilo Princip. The chief of the Austro-Hungarian general staff, Franz, Graf (count) Conrad von Hötzendorf, and the foreign minister, Leopold, Graf von Berchtold, saw the crime as the occasion for measures to humiliate Serbia and so to enhance Austria-Hungary’s prestige in the Balkans. Conrad had already (October 1913) been assured by William II of Germany’s support if Austria-Hungary should start a preventive war against Serbia. This assurance was confirmed in the week following the assassination, before William, on July 6, set off upon his annual cruise to the North Cape, off Norway.

    The Austrians decided to present an unacceptable ultimatum to Serbia and then to declare war, relying on Germany to deter Russia from intervention. Though the terms of the ultimatum were finally approved on July 19, its delivery was postponed to the evening of July 23, since by that time the French president, Raymond Poincaré, and his premier, René Viviani, who had set off on a state visit to Russia on July 15, would be on their way home and therefore unable to concert an immediate reaction with their Russian allies. When the delivery was announced, on July 24, Russia declared that Austria-Hungary must not be allowed to crush Serbia.

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  2. 2024年5月3日 · Roy Lichtenstein (born October 27, 1923, New York, New York, U.S.—died September 29, 1997, New York City) was an American painter who was a founder and foremost practitioner of Pop art, a movement that countered the techniques and concepts of Abstract Expressionism with images and techniques taken from popular culture.

  3. 2024年5月25日 · What is cell theory? What do cell membranes do? cell, in biology, the basic membrane-bound unit that contains the fundamental molecules of life and of which all living things are composed. A single cell is often a complete organism in itself, such as a bacterium or yeast. Other cells acquire specialized functions as they mature.

  4. 2024年6月5日 · Romeo and Juliet, play by William Shakespeare, written about 1594–96 and first published in an unauthorized quarto in 1597. An authorized quarto appeared in 1599, substantially longer and more reliable. A third quarto, based on the second, was used by the editors of the First Folio of 1623.

  5. 5 天前 · Independence Day, annual celebration of nationhood in the United States, commemorating the passage of the Declaration of Independence on July 4, 1776.

  6. 3 天前 · Adolf Hitler. Adolf Hitler reviewing German troops in Poland, September 1939. Adolf Hitler (born April 20, 1889, Braunau am Inn, Austria—died April 30, 1945, Berlin, Germany) was the leader of the Nazi Party (from 1920/21) and chancellor ( Kanzler) and Führer of Germany (1933–45).

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