The Federal Aid Highway Act of 1956.
The country of Greece is 480 miles across from east to west. The length of this country is 584 miles.
The Eisenhower Memorial Tunnel is 1.6 miles long...almost two miles long.
Chile
About 2500 miles. It is all the way across the country.
11,013 feet 2.1 miles
Probably a week - more if you are walking across really wild country.
The largest land mammal is the African elephant. No country truly has them as they graze freely across areas thousands of square miles in area.
Russia - approximately 25 miles across the Bering Strait to the Diomede Islands, Russia, or 50 miles to mainland Russia.
The US tapers from about 3200 miles across in the north to about 2500 miles across in the south.
Kansas is about 417 miles across and 211 miles north to south.
The Dominican Republic is about 90 miles west of Puerto Rico across the Mona Strait.
A very small country perhaps. In rare cases a tornado may travel over 100 miles, which is enough to cross some countries.