What evolutionary conditions would force arachnids to develop human-like intelligence?

I am designing a creature for a tall tale I'm composing and I have apparently hit a wall when it comes to envisioning an environment that would promote the creation of an intelligent race of arachnids. A member of said species would have an average height of two meters, possesses a brain capacity to formulate tribal societies and is able to fashion for itself bronze and iron weapons.

What kind of habitat would encourage these changes to a spider that starts out as say, a species from the portia genus?

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What evolutionary conditions would force arachnids to develop human-like intelligence?

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