What would the consequences be if there was a planet other than Earth, Venus, or Mars that was in the habitable zone?

Okay, there are two habitable worlds in the Solar System. One of them is Earth. Human history goes mainly the way it really went. Then, there is another planet with a sentient, equally advanced species of humanoids on it.

EDIT The other habitable planet would be on a separate orbital path from the Earth.

My questions are these:

• Where could I put this other planet.....I considered having it in place of the asteroid belt, is this too far away. Mars has to also exist in its current location and state, as well a Venus.

• How might us and this species interact? Would we more likely trade or go it war over something petty?

posted over 9 years ago

JDSweetBeat‭

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