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A civilization is a complex culture in which large numbers of human beings share a number of common elements. Historians have identified the basic characteristics of civilizations. Six of the most important characteristics are: cities, government, religion, social structure, writing and art.
Answer:
German submarine sank the British ocean liner Lusitania with 1,198 people aboard, among them over 100 Americans. When Germany announced on January 31, 1917 a policy of unrestricted submarine warfare, the United States cut diplomatic ties with Germany.
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