premise: Budapest again became the focus of national political drama in the late 1980s, when Hungary led the reform movement in eastern Europe that broke the communist monopoly on political power and ushered in the possibility of multiparty politics.
hypothesis: The thing at subject was the main focus more than 40 years ago
reason: It was late 1980's which is estimated 30 years ago, not more than 40 at all. That would be 1970