The two countries were America and Russia.
There were not only two countries.
The two countries were America and Russia.
Three countries.....India , China and Pakistan
Athens and Sparta
India and Great Britain were the two foes.
Germany and England .
Russia and United States.
Yugoslavia and Kosovo. This is wrong the two countries involved from WWII to 1991 was the United States and Russia (USSR).
Spain and Portugal were the two main countries involved in the demarcation of the New World through the Treaty of Tordesillas in 1494. This treaty divided the newly discovered lands outside Europe between the two nations along a meridian line.
Japan and the Soviet Union
retaliation from the americans and this got these two countries involved in ww2