CREATE TABLE table_57711 ("Year" TEXT, "Division" TEXT, "League" TEXT, "Reg. Season" TEXT, "Playoffs" TEXT, "Open Cup" TEXT)

Tell me the league with a regular 1st season
SELECT "League" FROM table_57711 WHERE "Reg. Season" = '1st'
SELECT "League" FROM "table_57711" WHERE "Reg. Season" = '1st'