Which of these was a major cause of the mexican-american war?
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a. american official john slidell insulted mexico's president.
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b. american troops invaded the capital of mexico.
c. the united states annexed texas.
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d. sam houston refused to return texas to mexico.
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Why was the united states motivated to establish the open door policy? a. the policy guaranteed american commerce with china. b. the policy supported the chinese nationalist cause. c. the policy led to a gain of american colonies in asia. d. the policy claimed damages from the chinese.