It increased because industrialization & mass production came to replace lots of jobs. So a farmer for example was replaced by machines and so he and his family would have to move from a rural area (farm) to an urban area (city) to get work doing hard labor in factories. The size of cities also grew because at this time the railroads made getting from places easier than ever and allowed many people to move to cities. Cities were also were many companies would set up factories and workers moved their to be closer to their jobs
Answer:
The USA became involved in Vietnam because it feared the spread of communism.
Explanation:
Pericles was an Athenian statesman who was instrumental in the establishment of democracy in Athens. He died during the Athenian plague. Option D is correct.
<h3>Who was Pericles?</h3>
Pericles was a Greek governor and warrior throughout Athens' Golden Age.
He was a significant and powerful figure in Athenian politics, particularly between the Greco-Persian Wars and the Peloponnesian War, and was dubbed “the first citizen of Athens” by Thucydides, a contemporary historian.
He died during the Athenian plague, as he was the victim of the plague, in 430 BC.
Therefore, option D is correct.
Learn more about the Pericles, refer to:
brainly.com/question/899609