Chicago is the third most populous city in the United States, located on the shores of Lake Michigan in Illinois. It grew rapidly in the mid-19th century and covers an area of nearly 150,000 acres. After the Great Chicago Fire of 1871 destroyed large parts of the city, efforts were made to rebuild. In the early 20th century, urban planner Daniel Burnham designed a plan to beautify Chicago against urbanization, focusing on the city center with parks, boulevards, and architecture. While the plan helped development and aesthetics initially, issues like traffic congestion and loss of green space arose as the population increased.