There are a number of factors that have contributed to the increase in poverty and homelessness.
After the Great Depression the United States had a more welfare model to support the economy, this resulted in development of government housing schemes, investment in infrastructure etc which all created jobs.
After World War II as the United States became the dominant economic force in the world, a more capitalistic model was enforced. By the 1960s, poverty began to rise again.
Up until 1970s manufacturing jobs still provided a huge cushion for the poor but as the United States opened by, more and more jobs started to leave America. Most of the jobs that left were the low-paying jobs for low skilled workforce.
Loss of jobs, low welfare benefits, the failure of the private sector to build low-cost homes, numerous recessions as well as the recent Great Recession, have all contributed to the rise of poverty and homelessness.
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The industrial revolution enabled a limited land area to support a larger population, spurred the European population, increased levels of social productivity, increased productivity, a wider range of means of subsistence, longer life expectancy, and reduced mortality, which was about human growth in the 19th century. From 1800 to 1914, the European population grew from 190 million to 460 million; the population of the United States increased from 5 million to about 100 million in the same period. Closely related to population growth, more and more people flocked to cities, Western society. Constant urbanization. In Germany, there were only two cities with a population of around 100,000 in 1840, and 48 in 1910. The population of the United Kingdom in 1901 showed that the population engaged in agriculture only accounts for 20% of the population employed by industrial enterprises. Around the United States, in the United States in 1915, about 40% of people live in industrial areas.