Westward expansion meant that the US acquired ever increasing amounts of land, and needed people, farmers, to settle there so it could maintained without a huge military presence. This led to massive immigration in the second half of the 19th century, as mostly Europeans came here seeking to finally have their own land.
It also added vast resources to the United States, both in terms of potential agricultural production and things like gold, silver and timber.
It stimulated the construction of the Transcontinental Railroad, and added new states to the country.
It further aggravated the divide between north and south, and accelerated the onset of the Civil War.
Answer:
If something happens directly to you, and you share a story about it, you are a primary source for that story. If someone else takes your story and tells that to someone else, they are a secondary source. "Tells the story to someone else" can include interpretations, articles, and analyses.
I would word this differently, btw. My wording's not great.
Answer:
Debora shows symptoms of anxiety disorder.
Explanation:
It is not possible to say that Debora has anxiety disorder, but you can say that she has a symptom of this disorder, because she is in a situation of great stress when she needs to be involved in activities that involve calculations and numbers. Stress is a strong symptom of anxiety disorder, especially when it is related to specific situations that serve as a trigger.
Standing to sue is the third one