The political limitations placed on Offenbach and Parisian theatre were gradually lifted, and operetta gained wide popularity. While Offenbach's earliest one-act pieces included "Les deux aveugles", "Le violoneux" and "Ba-ta-clan" (all 1855) did well, his first full-length operetta, "Orphée aux enfers" (1858), was by far the most successful. It became the first repertory operetta and was staged hundreds of times across Europe and beyond. Offenbach's legacy is seen in operettas throughout the late 19th century and beyond by encouraging Strauss the Younger to bring the genre to Austria-Hungary. Offenbach also traveled to the US and England educating musicians on the more than 100 operettas he wrote during his lifetime. This international travel resulted in the appearance of strong national schools in both nations. By the 1870s, however, Offenbach's popularity declined. The public showed more interest in romantic operettas that showed the "grace and refinement" of the late Romantic period. This included Messager's operetta "Véronique" and Louis Ganne's "Les saltimbanques". The 20th century found French operetta even more out of favor as the international public turned to Anglo-American and Viennese operettas, which continued to develop the art form into the late Romantic era.