In temperate climates, including in the major cities of developed countries many of the homeless poor are harmed by or die of exposure ()to extreme winter cold. Inadequate shelter almost always accompanies inadequate sanitation and unhygienic practices. Because the poor in developing nations commonly have no running water or sewage() facilities, human excrement and garbage accumulate, quickly becoming a breeding ground for disease. In cities, especially in ghettoes() and shantytowns that house only poor people, overcrowding can lead to high transmission rates of airborne diseases, such as tuberculosis. In particular, the incidence ( ) of acquired immune deficiency syndrome (AIDS) among poor people is higher than average. In developed countries tramps ( ) , hobos (-) , dossiers ( ) , down-and- outs , as they are called, can be found sleeping in derelict ( .) houses or on park benches . () If they are a nuisance( ) to passers-by,
republic into an urban state. The nation's economic progress, based on iron, steam and electrical power was speeded up by thousands of inventions like telephone and typewriter. 20 million immigrants poured into the country between 1870 and 1910. they agreed to work at almost any wages and under almost any conditions. The bettereducated blacks, who had left to the South searching for work became the object of viloent racial discriminationand were forced into ghettoes. THE FIRST WORLD WAR In April 1917 Congress declared war on Germany, because of attacks on American passanger ships by German submarines and the discovery of a German plot to encourage Mexico in war with USA. THE ROARING TWENTIES In the 1920s tariffs were brought to their highest level ever and taxes were drastically reduce. The Roaring Twenties suddenly ended in 1929 with the Wall Street crash. This crash marked the beginning of the worst
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