in VII or VIII century.
Yes, Serbia is a country.
1500
it means your counrty has been separated
Well you see.... its a country because GOD! made it.
she already been country how can she become country so the answer is no
In 2006. when Montenegro declared independence.
2000
The allianes caused WWI because when one counrty joined the war another counrty would have a problem with that counrty then he would join. Then that's how all counrty's caused the Great War because of It's problems with Each counrty.
a counrty trading with another counrty
The answer to this depends on the time-frame of the question. In 1919, the answer would have been Yugoslavia, but in 2006 the answer would be Serbia (i.e. the region of Serbia became incorporated into the Nation of Serbia).
Serbia become de facto independent from Ottoman empire in 1804. and 1807. And de jure in 1830.
Columbia