Next, research the US population in 2015 on the Internet. Note the total population of the United States, and analyze the population pyramid's
shape. In a short essay, analyze the changes that have taken place to the US population between 1950 and 2015. Based on your knowledge of US
history, why do you think the US population changed as it did in that span of time? What effects do you think these changes have had on the
physical environment of the United States? What do you think will occur between 2015 and 2070?

The population of USA in 2015 was 320.7 million.

Explanation:

The population of USA in 2015 was 320.7 million. From 1950 to 2015, the population of USA increases because the birth rate in USA is higher than the death rate which results in the increase in population. Due to increase in the population, more vehicles are used and more industries were installed to fulfilled the needs of the present population which results in the pollution of air and the environment is adversely effected. From 2015 to 2070, both population and pollution increases in USA and also in the world.

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