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The assassination of Archduke Franz Ferdinand in 1914 is important because it was the immediate catalyst for World War I, triggering a chain reaction of alliances and conflicts that plunged Europe into war. -
American neutrality in World War I was important because it allowed the U.S. to benefit economically by trading with both sides, maintain diplomatic relations with all belligerents, and avoid the immediate human cost of war. -
The First Battle of the Marne was important because it halted the German advance into France, saved Paris, and ended Germany's hope for a quick victory. -
The sinking of the Lusitania was important because the loss of 128 American lives fueled anti-German sentiment and contributed to the U.S. entry into World War I. -
The Battle of Verdun was important because it was a prolonged and brutal battle of attrition that became a symbol of French national pride and sacrifice, while its immense casualties weakened the German army. -
The Sussex Incident is important because it prompted Germany to issue the Sussex Pledge, which temporarily halted unrestricted submarine warfare and postponed U.S. entry into World War I -
The Battle of the Somme is important because it symbolized the brutal, high-casualty nature of trench warfare and demonstrated the futility of attempting a breakthrough in WWI. -
The Zimmerman Telegram is important because it was a coded message from Germany proposing a military alliance with Mexico against the United States, which significantly shifted American public opinion toward entering World War I. -
Germany's unrestricted submarine warfare is important because it directly led to the United States entering World War I, a turning point that helped the Allied powers win.