| Border | % Correct |
|---|---|
| Oregon-Washington | 97%
|
| California-Nevada | 96%
|
| California-Oregon | 95%
|
| Nevada-Oregon | 91%
|
| Nevada-Utah | 90%
|
| Montana-North Dakota | 85%
|
| Louisiana-Mississippi | 83%
|
| Arkansas-Mississippi | 81%
|
| Colorado-Utah | 81%
|
| Alabama-Georgia | 80%
|
| Alabama-Florida | 74%
|
| Arkansas-Tennessee | 73%
|
| Iowa-Wisconsin | 73%
|
| Indiana-Michigan | 72%
|
| Connecticut-New York | 66%
|
| Pennsylvania-West Virginia | 65%
|
| Maryland-Pennsylvania | 58%
|
| Connecticut-Massachusetts | 56%
|
| Massachusetts-Rhode Island | 51%
|
| Delaware-Pennsylvania | 26%
|