Greece remained a quite impoverished country throughout the 19th century. The country lacked raw materials, infrastructure and capital. Agriculture was mostly at the subsistence level, and the only important export commodities were currants, raisins and tobacco. Some Greeks grew rich as merchants and shipowners, and Piraeus became a major port, but little of this wealth found its way to the Greek peasantry. Greece remained hopelessly in debt to London finance houses. By the 1890s Greece was virtually bankrupt, and public insolvency was declared in 1893. Poverty was rife in the rural areas and the islands and was eased only by large-scale emigration to the United States. There was little education in the countryside. Nevertheless, there was progress in building communications and infrastructure, and elegant public buildings were erected in Athens. Despite the bad financial situation, Athens staged the revival of the Olympic Games in 1896, which proved a great success. All Greeks were united, however, in their determination to liberate the Greek-speaking provinces of the Ottoman Empire. Especially in Crete, a prolonged revolt in 1866–1869 had raised nationalist fervour. When war broke out between Russia and the Ottomans in 1877, popular Greek sentiment rallied to Russia's side, but Greece was too poor and too concerned about