Since his ascension to the Imamate of Nizari Ismailis in 1957 , the Aga Khan has been involved in complex political and economic changes which have affected his Nizari Ismaili followers , including the independence of African countries from colonial rule , expulsion of Asians from Uganda , the independence of Central Asian countries such as Tajikistan from the former Soviet Union and the continuous turmoil in Afghanistan and Pakistan .
These events included the independence of African countries from colonial rule , the expulsion of Asians from Uganda , the independence of Central Asian countries such as Tajikistan from the former Soviet Union and the continuous turmoil in Afghanistan and Pakistan .