portugal is a country on its own since 2010
Leon Trotsky was Stalin's main rival inside the Soviet Union. Stalin had him deported and finally assasinated. Adolf Hitler was Stalin's main rival outside the USSR. The Russian army invaded Germany and found Hitler dead.
The main currency is the Euro and the language is Portuguese.
Pompey was Caesar's main rival.
Same as everywhere, Mammonism!
Spain
Spain was their main adversary
portugal is a country on its own since 2010
Lamborghini is the main rival for Ferrari.
Their main rival is Manchester United
The name of Edison's main rival was Nikola Tesla.
The main rival of FC Schalke is Borussia Dortmund.
The main language spoken in Portugal is Portuguese.
Chargers
Football is the main sport in Portugal.
England is Australia's main rival at the World Championships and Commonwealth Games.
The main rival now is Alabama. Following that would be Auburn.