Solve these clues to fill the grid.
- Country in Asia with the Great Wall
- 4 Across
- A state in southwestern United States on the ___ border
- 5 Across
- A member of the Siouan people of the ___ river valley in ___ (plural)
- 6 Across
- The largest city in Pennsylvania
- 9 Across
- The region around the south pole: ___ and surrounding waters
- 11 Across
- A North American river that flows westward from the ___ Territory through central Alaska to
- 12 Across
- The largest city in ___ ___ State and in the United States
- 14 Across
- A state in southeastern United States between the Atlantic and the Gulf of Mexico
- 15 Across
- A state in northwestern North America
- 16 Across
- A state in east central United States
- 1 Down
- Largest city in Illinois
- 2 Down
- A republic on the island of Ceylon
- 3 Down
- A state in the United States in the central Pacific on the ___ Islands
- 7 Down
- A midwestern state
- 8 Down
- A midwestern state in north-central United States
- 10 Down
- A state in southeastern United States
- 13 Down