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Because artifacts such as this were maked by gold, so If they explore and conquer America they can find more objects like that.
8)Portugal conquered Brazil; Spain conquered Mexico, Central America and parts of South America.
french and the spanish tried to conquer Italy, fighting each other in Italy for 30 years
John Cabot was an Italian explorer and navigator whose 1497 discovery of parts of Northern America is commonly held to have been the first European encounter with the continent of North America.
Rome
Portugal
None.
Portugal
The same reason every European country set out to conquer others- To establish their superiority over OTHER European countries, gain wealth, steal natural resources, and spread their religion to the native peoples.
They brought European diseases with them.
By using European firearms to conquer their neighbors
They used European firearms to conquer their neighbors.