Obama
There is a Unites States Georgia. The Atlantic Ocean borders this US State. There is a country named Georgia. Its border is the Black Sea. When two locations have the same name, is important to specify "US" in the question, or "the country of".
Montana borders North Dakota and South Dakota to the east, Wyoming to the south, and Idaho to the west and southwest. To the north Montana borders Canadian provinces British Columbia, Alberta, and Saskatchewan.
:-) The Star-Spangled Banner
Tennessee borders eight other states.
federation
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The United States Constitution, or The Constitution of the Unites States of America, I believe.
The acronym US stands for United States; this is a federation composed of 50 states, not provinces. The US (unlike Canada) does not have provinces.
Washington which borders Oregon and Idaho,
New Mexico. Mexico is a country bordering the United States and New Mexico, a state in the the United States, has the same name. The only state in the US that has the name of a country that borders the US in it is New Mexico. The other country is Mexico.
They use provinces to describe different states of Canada.