As of the end of the 1960s, the city became a regional industrial center for the first time, which was heavily impacted by the Systematization process. Industrial factories like Armătura Zalău, Silcotub Zalău and Anvelope Silvania (recently bought by Michelin) hired thousands of workers, which sparked an increase in population as a result. The population influx gradually led to changes in the ethnic structure with the Romanians being now the majority and the Hungarians reduced to a minority. However, in many of the surrounding communes, the ethnic structure still remained unchanged (for example Vârșolț) are still populated by Hungarians; on the other hand, nearby villages such as Marin have a 100% ethnic Romanian population, basically unchanged for more than a century. In the 1970s with the working-class population expanding, housing estates of high-rise blocks of flats were built in both the centre and the outskirts of the town.