By discovering nuclear energy
Public health
Sanitation standards were created to protect the common good in particular in cities.
During the Second Industrial Revolution, many began moving to the cities. Overcrowding of people and horses created large amounts of waste and very little clean water. Disease ran rampant and sanitation systems were put into place to protect the health of people.
The sources of vice, religous threats, and other assualts on traditional values
<em>On December 1, 1955, the modern civil rights movement began when Rosa Parks, an African-American woman, was arrested for refusing to move to the back of the bus in Montgomery, Alabama.</em>
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<h2><em>Can I have a Brainliest?</em></h2>
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The answer is B. Development of railroad systems.
