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
when the bombing of pear harbour japanese americans weren't trusted and feared because the american people thought that they were going to turn around and attack them. Thats the reason they were sent to the camps. So, they could be closely watched.
Let's see... Ask the Crown from England to send me more troops to protect my country, take over all the people and land I could, and make LOOOOTS of alliances with powerful people and natives. Hope this helps!!!
