Simplify the following text for a Grade 9 native English-speaking person.
Original: Another term sometimes applied to the same general region is `` the heartland '' . Other designations for the region have fallen into disuse , such as the `` Northwest '' or `` Old Northwest '' ( from `` Northwest Territory '' ) and `` Mid-America '' .
Simplified: These names include the `` Northwest '' or `` Old Northwest '' , `` Mid-America , '' or `` the Heartland '' .