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In 1916, an offensive style of passing the ball at a very high height to be hit by another player was introduced. (Setting and Hitting.)
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In 1917, the game was changed from 21 to 15.
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In 1920, three hits per side and back row attack rules were introduced.
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In 1928, tournaments and rules were needed so the United Staes Volleyball Association was formed.
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In 1934, national volleyball referees were approved.
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1948, the first two mean beach tournament was held.
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In 1964, volleyball was introduced to the olympic games.
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In 1984, U.S won there first medals at the Olympics in L.A. Men taking gold and women taking silver.
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In 1990, the world league was created.
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In 1996, two person beach volleyball became an olympic sport.