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In 1890, when the superintendent of the census announced that a stable frontier line was no longer discernible,
Americans were disturbed because
Unlearned Reaction
An innate response or reflex that is not acquired or learned through experience but is naturally present from birth.
Learned Reaction
A response developed as a result of experience or practice.
Conditioned Stimulus
A previously neutral stimulus that, after becoming associated with an unconditioned stimulus, eventually comes to trigger a conditioned response.
Passionate Kiss
An intense, emotional act of kissing that expresses deep feelings of desire, love, or affection between two people.
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