I believe it is Missouri.
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.
Tennessee and Missouri both border 8 states.
Alaska and Hawaii are the only two states that do not border other US states.
Alaska and Hawaii are the only two states that do not border other US states.
Alaska and Hawaii do not border any other state.
Missouri & Tennessee & indeed they border each other not just once but twice
Missouri and Tennessee.
Tennessee and Missouri
Tennessee and Missouri they border eight other states
hawaii
Missouri and Tennessee are the only states to border eight others.