This duel is accentuated by a social dimension; Wydad is closer to the bourgeoisie class, while Raja is more popular since it has always been associated to the Moroccan trade union from which many of its founders and presidents belong.

The Casablanca Derby is considered to be the football pinnacle in the Kingdom, due to its number of matches which exceeded the 150 in 2022, making it the most played confrontation in Moroccan football history, and the enthusiasm of the supporters who attach particular importance to it since it represents the opposition of the most popular and successful clubs in Morocco.

[6] The club was founded in 1949 by a group of leftist activists and intellectuals who wanted to create a team that represented the working class.

On February 10, 1957, the first meeting took place between the two rivals, and witnessed Raja's victory 1–0 at Stade Philip in Casablanca.

[7][8] In 1978, Raja players withdrew from the match against Wydad during the last 10 minutes of the second-half because they were mistreated after conceding a penalty with a red card to their goalkeeper.

[10] On September 29, 2001, during the 100th derby which was part of the semifinals for the Moroccan Throne Cup, Youssef Belkhouja, a Wydad player, died on the pitch of a heart attack.

Raja scored first with a penalty by Abdellatif Jrindou, that result would have given Raja the title; but at the end of the match (at the 90+6 minute), a staggering strike from a long distance by Hicham Louissi gave Wydad the draw needed to win the league for the 16th time after 13 years of the last cup.

[15] In 2012, Wydad requested the FIFA and Royal Moroccan Football Federation to count the 5 titles that the club won in the regional championship organized during the Colonial Era in Morocco by french authorities before the creation of the Moroccan federation in 1956 as Botola titles.