Over the past century, Pennsylvania has experienced significant changes in its population, water resources, temperature, and overall development. As a state rich in history and natural beauty, Pennsylvania has seen rapid growth and urbanization, as well as environmental challenges. This essay will explore the evolution of Pennsylvania over the last 100 years, focusing on population growth, water resources, temperature changes, the status of wildlife, and the state’s progress in civilization. Population Growth in the Last 100 Years Pennsylvania’s population has grown steadily over the past century, reflecting both national trends and the state’s economic development. In 1920, Pennsylvania’s population was around 8.7 million. As of the 2020 census, the state’s population had grown to approximately 13 million. This growth has been driven by urbanization, the expansion of industrial sectors, and immigration, particularly to cities like Philadelphia and Pittsburgh. Throughout the mid-20th c
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