Why did the British prefer to develop the free spaces of North America, and not displace the Spaniards

Why did the British prefer to develop the free spaces of North America, and not displace the Spaniards from the more fertile southern lands?

Because the free spaces were huge territories that the British could take “with their bare hands”, without wars and bloodshed. In addition, in these territories, due to the more severe climate, there were significantly fewer Indians, whose neighborhood often led to major conflicts.

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