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Explain the five reasons why America's official interest in westward expansion surged in the 1840s.
Ivan Pavlov
Ivan Pavlov was a Russian physiologist best known for discovering classical conditioning, where a neutral stimulus becomes associated with a reflexive response.
Classical Conditioning
A learning process that pairs a naturally occurring stimulus with a previously neutral stimulus, leading to a learned response.
Researcher
An individual who conducts systematic investigations and analysis in a particular field of study to discover or interpret new knowledge.
Protective Withdrawal
A defense mechanism where individuals may retreat or isolate themselves from situations perceived as threatening or overwhelming.
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