The USL has plans to introduce promotion and relegation in 2028. Athletic Club Boise is moving up in 2027, joining the USL Championship after one season in USL League One. AC Boise set a USL League One record with more than 6,000 season ticket sales before its first match and has sold out every home game. It will add 3,000 seats to its stadium and also start construction on a training facility. The post USL: Athletic Club Boise is moving up after one season appeared first on Soccer America.