Wealthy, urban Italy has always had great political, cultural, and strategic importance for Europe. The leaders of its independent city-states intervened militarily in struggles among the European powers to its north and west but also against the expanding Muslim empires to its south and east. Italian culture supported military innovation, developing (for instance) new fortifications and naval organizations. After centuries of division, which limited Italy's power against the larger, unified European nations, the military played an important role in the nationalist unification of the entire country. Rapid industrialization followed, and along with it Italy's forays into overseas colonialism. Italy became a major power, but its turn to militant fascism during its expansionist era continues to haunt its state and military.