When you encounter a city like Chicago, it is virtually impossible to avoid the CTA and Metra trains. From short errands at the store to long trips home, the CTA is there like your personal car downtown. If you don't have enough money to spend on owning a car or you simply don't want to bear looking for parking in a congested city, the CTA is there for you. If more people used the CTA, the amount of gas polluting the earth would significantly reduce pollution levels in Chicago. Because there aren't as many cars on the road, not only does the amount of carbon monoxide escaping from cars decrease, but also the amount of cars on the road, which also decreases the amount of people on the road. Numerous laws establish how using the CTA could benefit the people of Chicago at large. These are just some of the reasons why Metra and the CTA have impacted everything from population to economics to political and environmental issues. Throughout Chicago's history, trains have always played an important role in its development. In the early years of Chicago's economic boom, trains brought livestock to slaughterhouses, where they were killed and butchered for meat and then shipped elsewhere. This region near the south side became known as the cattle yards. Another neighborhood began immediately after, known as the back yards. This neighborhood grew thanks to people who moved to the region to work on construction sites. Starting from this fact, we see that early in Chicago's history, it had a large population boom thanks to its extremely prosperous economy. Many immigrants have arrived over the years seeking political stability and personal freedoms in America along with other migrants seeking work which were all readily available to them in Chicago......middle of paper.... ..g I can use for my final article when I include evidence on the environmental impacts of trains on the city. I also liked this source because of the way it talks about these organizations competing to bring more money to the city, which shows that they are having a positive impact on Chicago's economy.Hampp, Andrew. “Advertising increases public transport budgets.” Advertising Age 79.40 (2008): 8. Academic research completed. Network. November 17, 2013. Hampp describes how cities like New York and Chicago are facing financial problems within their public transportation systems. They are starting to rely on funding from advertising to keep fares low for riders due to the rising costs of maintaining equipment and paying employees. I would prefer this source to be more recent, as it is from 2009, but I feel like the information I used fits my topic perfectly.