The answer is Precipitation
Answer:
In the context of classical conditioning, closing the door has become a(n) conditioned stimulus.
Explanation:
A conditioned stimulus, in classical conditioning, can be defined as a previously neutral stimulus that has become associated with an unconditioned stimulus, beginning to trigger a response.
It is very likely that closing a door didn't mean much to students in general (neutral). However, it was paired with the announcement of a quiz. Announcing a quiz (unconditioned) triggers a response - students feel surprised, anxious, worried, etc. After pairing up both stimuli a few times, students learn to associate them. Now, closing the door is a conditioned stimulus. Even if the professor does not announce a quiz, students will feel anxious and worried just by watching him close the door.
The years of industrial expansions after the civil war Brought significant changes to American society. The country became increasingly urban, and cities grew not only in term of population but also in size,with skyscrapers pushing cities upward and transportation extending them outward. Part of urban population growth was fueled by an unprecedented mass immigration to the United States that continued unabated into the first two decades of the twentieth century. The promise that America held for these new immigrants contrasted sharply with the rise of legalized segregation of African‐Americans in the South after Reconstruction. Meanwhile, ongoing industrialization and urbanization left their mark on how people spent their daily lives and used their leisure time.
Lincoln was going to protect the slaves states as they were but not allow any more, imposed martial law in Maryland and to continue in firmness and fairness.
