Answer:
Ending the First World War: the Paris Peace Conference Exactly five years after the assassination of Archduke Franz Ferdinand—the event that tipped Europe into world war—the Treaty of Versailles was signed in Paris on June 28, 1919.
Explanation:
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C: lowering trade taxes since they traded most materials to one another.
Water condenses so much that it becomes heavy and goes back to its original form, H2O