From having only 12 teams in 2005, Major League Soccer is closing in on 30 teams before the 2026 FIFA World Cup. Expansion of the MLS means more rivalries so lets go through the 10 biggest rivalries in the league today.Hudson River DerbyThe New York derby between New York Red Bulls and New York City FC represents the largest city in America. Following the first ever derby in 2015, Red Bulls had cut the allocation of NYCFC fans by two-thirds for their next home game because of NYCFC fan behavi...