From were cobber, the geographic centre of the USA or Greenwich? Where is your datum??
Exactly - it depends how you define it.
Geographically (as per the title), it's Alaska (ATTU Island) in the west and Maine (Sail Rock) in the east.
Longitudinally, it's Alaska (Amatignak Island) in the west and Alaska (Pochnoi Point) in the east.
Other measures based on population and attachment to the mainland produce different results.
Now 10% will agree with this, 60% will disagree and the remaining 30% will post something totally unrelated to the original question if forum posting standards are maintained.
So, France is in Eastern Europe according to the man on TV........?