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On June 28, 1914, the assassination of Archduke Franz Ferdinand of Austria-Hungary happened, which is considered the event that sparked the beginning of World War I.

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On July 28, 1914, Austria-Hungary declared war on Serbia, marking the beginning of World War I. It was a significant event that set off a chain reaction of declarations and military actions among various countries involved in the conflict.

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On August 1914, several significant events took place during the early days of World War I. On August 2nd, Germany invaded Luxembourg, and on August 4th, Germany invaded Belgium.

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On September 10, 1914, the American Federation of Labor (AFL) was actively working towards improving the working conditions and rights of laborers.

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On November 22, 1914, the American Federation of Labor (AFL) elected Samuel Gompers as its leader.

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On December 25, 1914, during World War I, an extraordinary event known as the Christmas Truce occurred. Soldiers from opposing sides put down their weapons and celebrated Christmas together in the trenches.

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During the period of April 22 to May 25, 1915, one of the significant events of World War I occurred. It was the infamous Battle of Gallipoli.

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On May 7, 1915, the British ocean liner RMS Lusitania was sunk by a German submarine, resulting in the loss of many lives.

On May 23, 1915, Italy declared war on Austria-Hungary, joining World War I on the side of the Allies.

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On October 12, 1915, during World War I, the British nurse Edith Cavell was executed by German forces. She was accused of helping Allied soldiers escape from German-occupied Belgium.

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In 1916, from February 21 to December 18, a significant event took place known as the Battle of Verdun. It was one of the most brutal and protracted battles of World War I, resulting in heavy casualties for both sides.

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During the period from July 1 to November 18, 1916, one of the most significant battles of World War I took place: the Battle of the Somme.

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On November 7, 1916, the U.S. presidential election took place, with Woodrow Wilson being reelected for a second term.