 Complete the following phrase:  In 1949 Chiangs government and army retreated to Taiwan, where Chiang imposed martial law and persecuted critics during the White Terror. Presiding over a period of social reforms and economic prosperity, Chiang won five elections to six-year terms as President of the Republic of China and was Director-General of the Kuomintang until his death in 1975, three years into his fifth term as President and just one year before 