During the Nazi invasion of France during World War II Alemán returned to Argentina and lauded as the most prominent Afro Argentine and Argentine jazz musician. He established a residency at the Alvear Palace Hotel, and had a hit with "Rosa Madreselva" ("Honeysuckle Rose"). Aleman also continued to record and perform with a swing quintet and a nine-piece orchestra. He became romantically involved with actress Carmen Vallejo with whom he had a daughter, Selva Alemán.He remained popular into the late 1950s, before the rise of rock n roll and more popular developments in tango. In 1972, he recorded an album and reissued some of his music. He toured and appeared on television. He performed and taught in his native country until his death at age of the 71 in 1980.