At the time, Philadelphia was the capital of the country. Also, everyone traveled by horses so they picked a place that was equal distance from all colonies so that representatives would not have to...
Yes
That is the name that William Penn gave it when he founded it.
Because when it was founded by William Penn he named it Philadelphia which means "City of Brotherly Love" in Greek.
Pennsylvania Philadelphia is a city located in the state of Pennsylvania. On the north eastern side of the United States of America. In Pennslyvania