Slavery has existed for many years, Many plantation owners used slaves to get the work done faster. Plus plantations couldn't survive without slave labor.
In the years from 1900 to the present, life expectancy in the United States has drastically increased.
The tremendous increase in life expectancy during the last century may be the greatest human achievement.
In the 110 years between 1900 and 2010, the United States' life expectancy at birth increased from 47.3 to 78.7 years (Centers for Disease Control and Prevention/National Center for Health Statistics [CDC/NCHS], 2012, 2013). Declines in infectious diseases and fatalities disproportionately among the young caused this longer lifespan. After infectious diseases accounted for the majority of deaths, the leading causes of mortality were cancer and cardiovascular diseases. In the second half of the 20th century, these then became the focus of science and medicine.
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The answer is, "Just noticeable differences."
Weber's law was named after Ernst Weber, a German psychologist. The law postulates that the strength and intensity needed to identify changes in a stimulant correlates to the magnitude of the stimulant. In other words, the more severe a stimulus is, a greater change needs to be made for it to be noticed.
Answer: food desert
Explanation: Food desert which is the direct opposite of food oasis is an area with decreased or limited access to affordable healthy food i.e decreased access to food and availability of healthy food.
Food desert is a good example of institutionalized bias in food system that have a negative impact on health of people living in such areas. Many groups that have entered the US have experienced this form of discrimination in one form or the other.