Tennessee or Missouri; both share borders with eight states.
Russia
No state borders 9 other states, the most borders any state has is 8 (Tennessee and Missouri)
Missouri and Tennessee both border the most states, 8.
Tennessee and Missouri they border eight other states
China borders the most other states in the world with 14 neighboring countries. These countries are Mongolia, Russia, North Korea, Vietnam, Laos, Myanmar, Bhutan, Nepal, India, Pakistan, Afghanistan, Tajikistan, Kyrgyzstan, and Kazakhstan.
Brazil borders ten other countries. It borders every other country in South America except Ecuador and Chile.
South Australia :)
Both Tennessee and Missouri share borders with eight other states.
Missouri has to be one of them and Tennessee is the other.
Madhya Pradesh is the state in India with 9 borders with other states such as Gujarat, Maharashtra, Telangana, Chhattisgarh, Andhra Pradesh, Vidarbha, Bundelkhand, Uttar Pradesh and Rajasthan
Tennessee borders eight other states: Kentucky, Virginia, North Carolina, Georgia, Alabama, Mississippi, Arkansas, and Missouri.