After hundreds of games, goals and memorable moments, the 2017 MLS season will conclude in the same way it did last year: With Toronto FC and the Seattle Sounders facing off in MLS Cup at BMO Field.

Last year, drawing from the 2,500-year idea that “the enemy of my enemy is my friend,” we asked representatives of a number of fan bases around the league how they were aligning for the 2016 MLS Cup: ...