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Gavrilo Princip, a Bosnian Serb nationalist, killed Archduke Franz Ferdinand of Austria-Hungary and his wife, Sophie, on June 28, 1914, in Sarajevo. The pair was singled out during a motorcade due to anti-Austrian animosity prevalent in the area. The assassination directly prompted Austria-Hungary to declare war on Serbia, which in turn sparked the chain of events that ultimately resulted in the start of World War I. Many people believe that the assassination of Archduke Franz Ferdinand set off the intricate network of rivalries and alliances that sparked the Great War.

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In January 1917, German Foreign Minister Arthur Zimmermann sent the German ambassador in Mexico a covert diplomatic message known as the Zimmermann Telegram. In case the United States entered World War I on the side of the Allies, Germany suggested in the telegram that Mexico and it form a military alliance against the United States. The American government was made aware of the contents of the message when the British intercepted and decrypted it. The Zimmermann Telegram's disclosure significantly influenced American public opinion to turn against Germany and ultimately led to the country's choice to support the Allies in World War I.

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One of the most significant incidents of World War I was the sinking of the RMS Lusitania on May 7, 1915. A German U-boat torpedoed the British ocean liner off the coast of Ireland, killing 1,198 persons, 128 of them were Americans. The strike increased hostilities between the US and Germany, which helped the US enter the war in the end. In addition to intensifying anti-German feelings, the sinking of the Lusitania influenced popular opinion against Germany during the war.

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President Woodrow Wilson urged Congress to declare war on Germany in a landmark speech he gave on April 2, 1917. Wilson stressed in his speech the need to create a "safe space for democracy," emphasizing the moral need to protect democratic values from the dangers that German aggression poses. A crucial juncture in American history was reached when Congress promptly authorized the declaration of war in response to the President's request. The United States formally entered World War I on April 6, 1917, four days later, joining the Allies in their attempts to end the war and defend democratic values around the world.

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The US entered World War I when the United States Congress made history on April 2, 1917, by declaring war on Germany. The statement was sought by President Woodrow Wilson in reaction to Germany's unrestricted submarine warfare and the sinking of many American ships. The proclamation represented a change in American opinion as the country went from being neutral to actively taking part in the war. While some members of Congress argued for peace, the majority of Congressmen felt that going to war was important to defend democratic values and safeguard American interests. In the end, this proclamation created the conditions for the US to contribute significantly to the Allied effort during World War I.

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The Selective Service Act, which was passed into law on May 18, 1917, was a crucial component of American legislation during World War I. This statute, popularly referred to as the draft, gave the federal government the power to compel men to enlist in the military. All men between the ages of 21 and 30 were required to register for possible military duty under the Selective Service Act. The United States' growing demand for soldiers as it got more involved in the conflict led to the implementation of the draft. The Selective Service Act was crucial in providing the United States with the manpower it needed to make a substantial contribution to the Allied victory in World War I by building a sizable and diversified armed force.

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The Armistice, which was signed on November 11, 1918, officially ended World War I and was a historic moment in history. The signing, which put a stop to hostilities on the Western Front, took place in a train compartment in the French forest of Compiègne. The Allies and Germany concluded the Armistice, which essentially put an end to hostilities and opened the door for peace negotiations. In many nations, November 11 is observed as Armistice Day or Remembrance Day in remembrance of the soldiers who fought and gave their lives in the conflict. The Allied Powers and Germany officially came to an end of their war in 1919 when they signed the Treaty of Versailles, which also shaped the post-war geopolitical environment.

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The Treaty of Versailles is a peace treaty that was signed in 1919 in Paris. The treaty was made to end WWI between Germany and the Allied Powers. There deal with Germany included territorial losses, military restrictions, a war guilt clause. The treaty is know for it's harshness and will then lead up to WWII

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The League of Nations was an organization formed in 1920 after World War I ended. It's goal of promoting peace and preventing another war to come. It had members from various countries but notably lacked the participation of the United States. Later the League succeded aiming to improve international cooperation and maintain global peace.

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The Paris Peace Conference of 1919 made a huge impact post-World War I, in its effort to establish lasting peace. The conference resulted in the signing of the Treaty of Versailles, which officially ended the war between Germany and the Allies. The most important points included territorial adjustments, reparations from Germany, and the creation of the League of Nations to promote international peace. However, the treaty's punishment measures and the "war guilt clause" sowed seeds of resentment, contributing to the geopolitical tensions that led to World War II.

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Georges Clemenceau became a significant leader in France during World War I, appointed Prime Minister and Minister of War in November 1917. His leadership was crucial in rallying the French populace and military during the German attacks of 1918. His resolute and determined approach, often referred to as the "Tiger's Will". Clemenceau's firm stance and appointment of Marshal Ferdinand Foch helped turn the tables of the war, leading to victory for the Allies. Known as "Père-la-Victoire" (Father Victory), he played a pivotal role in the signing of the Armistice on November 11, 1918. His dynamic leadership during this critical period earned him widespread popularity and recognition.

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David Lloyd George, who became British prime minister in December 1916, was a big figure in ww1. Knowned for his leadership, he aimed for complete victory over Germany and had disagreements on tactics with his military superiors. Lloyd George balanced business and labor concerns while serving in 1915, increasing Britain's war production. The Allied victory was largely attributed to his attempts to organize decision-making and create a coalition government. In 1918, he was also instrumental in the creation of the Allied Supreme War Council and the appointment of French General Ferdinand Foch as supreme commander.

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"Georges Clemenceau." World History: The Modern Era, ABC-CLIO, 2024, worldhistory.abc-clio.com/Search/Display/316977. Accessed 7 Mar. 2024.

"David Lloyd George." World History: The Modern Era, ABC-CLIO, 2024, worldhistory.abc-clio.com/Search/Display/314922. Accessed 7 Mar. 2024.