In the early years of the People's Republic of China, development of Peking opera was encouraged; many new operas on historical and modern themes were written, and earlier operas continued to be performed. As a popular art form, opera has usually been the first of the arts to reflect changes in Chinese policy. In the mid-1950s, for example, it was the first to benefit under the Hundred Flowers Campaign, such as the birth of Jilin opera.