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One cause of WW1 was the system of alliances that linked the European nations to each other. The system required member nations to come to one another's aid in case of an attack. When the conflict started, this led to the division of Europe into two camps, The Central Powers and The Allied Powers.
Germans stared to use U-Boats, also known as submarines to attack and sink British ships in the British Blockade. Then the Germans sunk the Lusitania who had american civilians on it. This act was one cause for america to join in WW1.
Another key factor to WW1 was militarism. When Germany modernized its army and added to its navy, Britain felt it had to do the same. This then led to all of the countries to go into a power struggle to see who had the best military.
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