Why do you think Spain wanted exclusive rights to the new world

During the old times, Spain's primary interests are the 3G's (God, Glory, & Gold). It is logical for this country, being a colonizer, to gain interest in acquiring as many territories as possible. The countries strategy involves depriving other countries to access the lands discovered by Christopher Columbus except when there is permission from the Spanish authority. This gave Spain the opportunity to monopolize the lands of the New World.