It is considered the pinnacle of sports car racing in North America, attracting top-tier manufacturers, teams and drivers.

On November 20, 2012, the merger committee announced that SME Branding were selected to develop the name, logo and identity of the new series.

American Le Mans CEO Scott Atherton announced the new sanctioning body would remain IMSA while Ed Bennett revealed the new titles for the series' five classes.

[7] On August 9, 2013, Fox Sports 1 announced it had signed a TV contract with IMSA to televise the entire USCC season between 2014 and 2018.

The series is split into two classes known as Grand Sport (GS), intended for large capacity GT-style cars, and Street Tuner (ST), consisting of smaller sedans and coupes, some of which are front-wheel drive.

The IMSA Continental Tire Sports Car Challenge until 2013 supported some Rolex Series races but also headlined some of its own dates.

The class features cars built by Automobile Club de l'Ouest's (ACO) 4 licensed manufacturers (Riley-Multimatic, Ligier, Oreca and Dallara) to the specifications of the FIA/ACO 2017 Global LMP2 regulations.

This was a one-make spec class in which all cars that drivers and teams used were Oreca FLM09 LMPC's powered by 6.2L Chevrolet V8 engines which made 430 hp each.

Introduced in the 2021 season, having been in the IMSA Prototype Challenge category as one of the feeder series to the IMSA WeatherTech SportsCar Championship, this class of prototypes features cars built according to ACO's 2020 LMP3 Generation II ruleset specifications from manufacturers such as Ligier, ADESS, Ginetta & Duqueine Engineering.

A continuation of the ALMS GT class, it consisted of cars matching the ACO's GTE specification and competed in the series between the 2014 and 2021 seasons.