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"Franz Ferdinand's" assassination is important because the assassinations started a chain of events that led to the outbreak of the First World War in early August. He's dead started the First World War and after the start of the war European started to form the "Triple Alliances" and "Triple Entente". https://www.history.com/news/the-assassination-of-archduke-franz-ferdinand -
After one month of the assassination within six days, European countries started to declare one another. Over twenty-one countries declare war and participate in World War I over a period of four years. The fight known as the Great War.
Some example: Germany declares War on Russia.
Britain declares war on Germany.
Austria declares war on Russia.
Japan declares war on Germany.
All those countries declare each other in August,1914 https://guides.loc.gov/chronicling-america-wwi-declarations -
A. The alliance system was established to promote collective security. This was based on the belief that if the key European nations formed strong alliances, a major conflict could be averted.
B. The Triple Alliance comprised Germany, Austria-Hungary and Italy, whereas the Triple Entente consisted of England, France, and Russia. https://www.iwm.org.uk/history/what-you-need-to-know-about-pre-first-world-war-alliances -
In addition, mobile warfare on the Western Front ended at the Battle of the Marne. The battle settled into "trench warfare" on the Aisne when the Germans left and the Allies reunited with them. Early in the conflict, modern weapons resulted in a high death rate. https://www.history.com/this-day-in-history/first-battle-of-the-marne-begins
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Conflict between nations resulted from the 1915 German "U-boat" sinking the naval ship use of RMS Lusitania, which profoundly influenced public opinion, particularly within the United States, towards getting into World War I. https://www.history.com/news/how-the-sinking-of-lusitania-changed-wwi -
On the battlefield, "mustard gas", a poisonous chemical weapon, caused disaster. Rapid-firing "machine guns" had a big impact on methods in World War I. Navy groups and merchant vessels were seriously threatened by "U-Boats", which are subtle underwater vehicles. https://disarmament.unoda.org/wmd/chemical/
https://www.loc.gov/collections/world-war-i-rotogravures/articles-and-essays/military-technology-in-world-war-i/
https://www.history.com/news/u-boats-world-war-i-germany -
During World War I, British and French soldiers fought in the huge and terrible Battle of the Somme on the Western Front, which left both sides with significant deaths and little advancement. It serves as a reminder of the terrible truth of World War I, which was marked by long trench battle and the development of new weapons of war. https://www.iwm.org.uk/history/5-things-you-need-to-know-about-the-battle-of-the-somme -
Even though the US avoided taking a "neutrality" stance and played a vital part in the war, President "Woodrow Wilson's" choice to keep America out of the conflict resulted in the US giving essential supplies and weapons to the Allied Powers. https://www.archives.gov/milestone-documents/address-to-congress-declaration-of-war-against-germany
https://history.army.mil/html/books/077/77-3/cmhPub_077-3.pdf -
Due to the army' attacks and responses in 1915 and 1917 Combat in trenches resulted.There was no way to move the fight significantly since both sides created a huge defensive line between the front lines. Front’https://www.nam.ac.uk/explore/1917-year-stalemate -
1917 noticed the second revolution in Russia, which ended in "Tsar Nicholas II's" surrender and the fall of the Romanov dynasty.Afterwards, the Soviet Union took control and chose to end the war. https://www.history.com/news/world-war-i-russian-revolution -
On November 11, 1918, the Armistice of Compiègne was signed, marking an end to fighting on the Western Front during World War I and opening the door for peace talks and the 1919 Treaty of Versailles. Allied Powers(Britain, France, America, Russia, Italy, Japan) won WWI. The Central Alliance lost WWI( Germany, Austro-Hungarian Empire, Ukraine, Italy). https://www.theworldwar.org/learn/about-wwi/armistice -
By placing severe penalties on Germany, the 1919 Treaty of Versailles put an official end to World War I and created the way for social unrest and the beginning of World War II. https://www.history.com/news/treaty-of-versailles-world-war-ii-german-guilt-effects -
After World War I, the global organization known as the League of Nations was established with the goal of promoting global peace and cooperation. According to which the nations involved would work together to avoid wars and resolve disputes. https://history.state.gov/milestones/1914-1920/league