Possible Clues:

• Abbr. after N. or S.
• Terr. that's now two states
• U.S. territory that's now two states
• Abbr. in two state names
• Part of two state abbrs
• Old Indian postal system had beginnings in Delhi and Karachi
• N. or S. state, briefly
• U.S. terr. that's now two states
• North or South state abbr
• Part of two sts