 The country completely recovered from WWII and achieved a very high GDP and economic growth rate, significantly higher than those of the present-day republic.The constitution of 1963 balanced the power in the country between the Croats and the Serbs and alleviated imbalance coming from the fact that the Croats were again in a minority position.Trends after 1965 (like the fall of OZNA and UDBA chief Aleksandar Ranković from power in 1966), however, led to the Croatian Spring of 1970–71, when students in Zagreb organized demonstrations to achieve greater civil liberties and greater Croatian autonomy.