-
was the direct trigger for World War I. The murder by a Bosnian Serb nationalist ignited a diplomatic crisis that set off a chain reaction of military mobilizations and declarations of war, as European powers were drawn into the conflict by their complex system of alliances. -
it allowed the United States to grow into a global economic power and set the stage for its eventual, decisive intervention -
it ended Germany's plan for a quick victory, initiating the prolonged and devastating trench warfare on the Western Front. -
it shifted global public opinion against Germany, led to a temporary halt in Germany's unrestricted submarine warfare with the Sussex Pledge, and set the stage for the United States' eventual entry into the war -
its immense casualties, its symbolic value as a French stand against German attack, and its strategic impact. -
a crucial diplomatic stepping stone that temporarily kept the U.S. out of World War I -
lies in its immense human cost, which made it a symbol of the brutal and "futility" of modern trench warfare -
a secret message from Germany to Mexico proposing a military alliance against the United States, and its public revelation in 1917 was critically important because it inflamed American public opinion, ending the U.S.'s neutrality and helping to push the country into World War I -
a major cause for the US entry, its impact on international law, and its revolutionary effect on naval warfare by using submarines to attack enemy and neutral vessels without warning to cripple supply lines -
it tipped the scales in favor of the Allies, providing much-needed soldiers, supplies, and financial aid that helped secure victory -
ability to provide a massive, rapid influx of personnel when volunteers were insufficient, enabling the U.S. to deploy large numbers of troops overseas -
its profound and lasting impact on the balance between national security and civil liberties, particularly freedom of speech and the press -
provided much-needed reinforcements that boosted Allied morale, shifted the momentum of the war, and ultimately helped secure an Allied victory -
they served as the basis for negotiating the end of World War I and establishing a new world order based on open diplomacy, free trade, and national self-determination -
a crucial historical event due to its massive global death toll (estimated at 50-100 million), its impact on demographics by disproportionately killing young adults, and its influence on public health strategies -
allowed Germany to transfer troops from the Eastern Front to bolster their efforts on the Western Front, intensifying fighting there -
one of the first major tests of the First Amendment and sparked intense debate over freedom of speech and the press -
it was the largest and deadliest battle fought by the American Expeditionary Forces (AEF), proving the U.S. military's strength and significantly contributing to Germany's defeat and the end of the war -
it ended the fighting of World War I, ushering in a time of immediate relief while also setting the stage for significant political, social, and economic transformations -
a pivotal event that concluded World War I, leading to the Treaty of Versailles and other treaties with the defeated Central Powers