Map

The map of the United States looked very different from the way it looks today.  In the book, Historical Atlas of the United States, by Derek Hayes, it is amazing to see how the state boundaries have changed from Revolutionary times, and shows each state's claims to lands in the west. William Penn arrived in 1682, and divided his land into 3 counties, Chester being one of them. This county was subsequently divided into Lancaster, Delaware, and Chester counties.  Chester is located in the southeast corner of the state.