"That any attempts by congress to interfere with the institution of slavery in any of the territories of the United States would create just grounds of alarm in many of the States of the union; and that such interference is unnecessary, inexpedient, and in violation of good faith; since, when any such territory applies for admission in to the union as a state, the people thereof alone have the right, and should be left free and unrestrained, to decide such question for themselves."-Source: State Senator Broderick, Journal of the California Legislature, 1850The excerpt is best understood as a response to which of the following historical developments?

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