I don't have the vaguest idea what 'verb to infinitive' is or means, but I agree with you: to push should be used after caused. CB
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Stenka25What caused the **** sapiens push out of Africa?Are you aware that 'push' is a noun here?
CalifJimAre you aware that 'push' is a noun here?I certainly wasn't. Thanks, Jim. Since English has hardly any inflections, I am sometimes led astray. Besides, I now realize what the OP's 'verb to infinitive' means. When I first saw it, I thought it had something to do with a verb becoming an infinitive, i.e. I thought that the 'to' was a preposition.
Stenka25What caused the **** sapiens push out of Africa?The clue is the definite article before **** sapiens. If Home sapiens were to be followed by a verb (What caused **** Sapiens to push out of Africa?) there would be no article.