Did you know that Philadelphia is sometimes called the birthplace of America? This is because the Declaration of Independence was signed there in 1776. Find out more about this fascinating city in Philadelphia, part of the American Cities series. American Cities takes young readers on a tour of our capitals and major centers. Each book explores the geography, history, and people that give the featured city its distinctive flair.This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with video, audio, weblinks, slideshows, activities, hands-on experiments, and much more.