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The original district courts were each assigned one judge.With the growth in population and litigation,Congress has periodically had to add judges to most ofthe districts.The Federal Judgeship Act of 1990 created 74 new district judgeships,bringing the current total to 649.Today all districts have more than one judge;the Southern District of New York,which includes Manhattan and the Bronx,currently has 28 judges and is thus the largest.Because each federal district court is normally presided over by a single judge,several trials may be in session within the district at any given time.