Tax reforms took place in 1538 and 1558, whereby multiple complex taxes on independent farmers were simplified and standardised throughout the district; tax assessments per farm were adjusted to reflect ability to pay. Crown tax revenues increased, but more importantly the new system was perceived as fairer and more acceptable. A war with Luebeck in 1535 resulted in the expulsion of the Hanseatic traders, who previously had had a monopoly of foreign trade. With its own businessmen in charge Sweden's economic strength grew rapidly, and by 1544 Gustavus had support from 60% of the farmlands in all of Sweden. Sweden now built the first modern army in Europe, supported by a sophisticated tax system and government bureaucracy. Gustavus proclaimed the Swedish crown hereditary in his family, the house of Vasa. It ruled Sweden (1523–1654) and Poland (1587–1668).