The great US of A is made of 50 states created by imaginary lines and a lot of debate, legislation, and in some cases, war. The smallest state is Rhode Island and the largest state is Alaska. Based on square mileage, Rhode Island can fit inside Alaska more than 500 times, but what Rhode Island lacks in size, it makes up for in neighbors. Alaska has zero American neighbors. Rhode Island borders at least two states, maybe three, depending on how you draw your borders.
The country is filled with some oddly shaped states. Tennessee and Missouri have the most opportunistic shapes and both border eight states, which is a tie for the most. Maine only borders one. Arizona, New Mexico, Utah and Colorado form America's popular "Four Corners" section of the country, which means each of them automatically borders another two states. Texas and Arkansas share a border and famously share a town. You can meet two people from Texarkana, but one might be from Arkansas and one might be from Texas.
Carolina split before the country was officially founded. Virginia split because of differences during the Civil War. Dakota was actually one state until nobody could agree on a single capital and two Dakotas were formed in 1889. You know at least one neighbor for those states, but what about the rest. If we give you a state, can you give us its neighbor?