<span>Assuming that this is referring to the same region that was posted before with this question, <span>the correct response would be that the encroachment of Europeans forced many native tribes that had up until this point been rivals to form alliances in order to stop the spread of European settlement. </span></span>
Magnesium and calcium have similar chemical properties because they have the same number of electrons in their valence shells.
Your answer would be D
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