instruction: Extract what previous provinces Kardzhali a part of in the past
output: Kardzhali was once a part of Stara Zagora province and Haskovo Province until it was restored in 1999
input: The territory of Kardzhali province was acquired by Bulgaria during the First Balkan War in 1912. In 1913 the region was organized as the district (окръг, okrăg in Bulgarian) of Mestanli. This district was part of Stara Zagora province from 1934 until 1949, then it was transferred to the newly formed Haskovo district. In 1959 Kardzhali became the center of a new district with similar borders to the current province. Between 1987 and 1999, the region was part of Haskovo Province, after which it was restored, now as a province and with slightly changed borders.