no states
In the American Civil War, the border-states were the four slave-states of the Upper South that had voted (narrowly) to stay loyal to the USA. They were Missouri, Kentucky, Maryland and Delaware. At the beginning of the war, Lincoln's biggest worry was that these states would fall into the arms of the Confederacy. This was why he allowed them to continue practising slavery, so as not to upset leading slave-owners in these states.
Texas does.
There are 3 states along the eastern border of New York State. They are Massachusetts, Vermont and Connecticut.
Alaska and Hawaii do not border any other state.
the state that shares a border with Russia
There are no states in Illinois. Illinois is a state. States only have counties, cities and towns.
Alaska is the biggest state. -????
At the beginning of the US Civil War, the "southern" border States were Kentucky and Missouri. In this answer, Maryland is excluded in that although it was a pro=southern slave State, it cannot be considered a border State.
Missouri and Tennessee border eight states, the most of any.
Every state borders another except Alaska and Hawaii. Alaska does, however, border Canada; while Hawaii is an island. The continental state with the least borders is Maine, at one state, while the states with the most border states are Missouri and Tennessee, at eight states.
Delaware (perhaps the most overlooked border state), Kentucky, Maryland and Missouri were the border states that did not secede from the Union.
In the Border States the percentages of slaves was that of 14,25%.