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The Battle of the Marne was important because it stopped the German army from reaching Paris, changing the course of World War I and leading to a long period of fighting in trenches. -
The assassination of Archduke Franz Ferdinand led to World War I because it increased tensions between countries and triggered alliances. -
Austria-Hungary declared war on Serbia because it blamed Serbia for the assassination of Archduke Franz Ferdinand. -
World War I started because national rivalries and alliances turned the assassination of Archduke Franz Ferdinand into a larger conflict between major powers. -
France invaded Alsace to get back land it had lost to Germany in the past and to protect itself from the German threat.
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Austria-Hungary invaded Russia to fight against its enemy and help Germany during World War I.
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The Allies landed on the Gallipoli Peninsula to open a new front, help Russia, and try to defeat the Ottoman Empire during World War I. -
Italy declared war on Austria-Hungary to join the Allies and gain territory during World War I. -
Germany attacked Verdun to hurt the French army and try to win the war. -
A German submarine sank the passenger ship Lusitania to disrupt supplies to Britain during World War I. -
The United States declared war on Germany to join the fight against the Central Powers in World War I. -
American combat forces arrived in France to help the Allies fight against Germany in World War I. -
Russia signed an armistice with Germany to end fighting and focus on its own internal issues during World War I. -
The Fourteen Points were President Wilson's ideas for peace after World War I to help prevent future wars.
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United States forces won the Battle to help defeat the enemy in World War I. -
World War I ended when an armistice was signed, stopping the fighting between the Allies and Germany.