A large percentage of Americans live in the states of the Northeast, particularly New Jersey, New York, and Pennsylvania. New Jersey is the nation's most densely populated state, with nearly 95 percent of its population living in urban areas. New York, the "Empire State," played an important role in the rise and growth of the United States and remains vital in global affairs. New York City is home to more people than any other American city. Some of the most important events in American history took place in Pennsylvania, including the writing of the Declaration of Independence and the pivotal Civil War battle at Gettysburg. This book in the LET'S EXPLORE THE STATES series provides information about these three important states, from their geography, history, and government to their economy, population demographics, and major cities.