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Difficulty: EasyDistinguishing Main Idea from Supporting Evidence

For decades, economic historians maintained that the rapid expansion of rail networks in late nineteenth-century North America was the primary catalyst for regional industrial development. They argued that reduced transportation costs opened distant markets, allowing localized manufacturing hubs to achieve unprecedented economies of scale. However, recent empirical re-examinations suggest that this traditional view overstates the direct impact of rail expansion. While rail infrastructure certainly facilitated cargo movement, regional manufacturing growth was predominantly driven by prior advancements in local financial institutions and urban banking networks. These financial systems provided the essential venture capital and liquidity required for factory mechanization long before rail lines reached rural industrial centers. Consequently, rail transport should be understood not as the fundamental driver of industrialization, but rather as an auxiliary mechanism that amplified a growth trajectory already established by local financial capital.

Which of the following best states the main idea of the passage?

  1. Rail expansion in late nineteenth-century North America was an auxiliary factor in regional industrial growth rather than its primary catalyst.Answer
  2. B
    Advancements in local financial institutions and urban banking networks provided essential venture capital for factory mechanization.
  3. C
    The expansion of rail networks was the primary catalyst for industrial development because it significantly reduced transportation costs.
  4. D
    Rail transport hindered overall economic progress by diverting critical capital away from urban banking networks.
  5. E
    Recent empirical re-examinations demonstrate that rail infrastructure had no measurable impact on nineteenth-century manufacturing.

Answer

The main idea of the passage is that rail expansion in late nineteenth-century North America functioned as an auxiliary factor amplifying industrial growth rather than serving as its primary driver.
The passage begins by outlining a traditional historical view regarding rail expansion, pivots with the contrastive transition 'However', and concludes by asserting that rail transport was an auxiliary mechanism rather than the primary driver of growth. The choice stating that rail expansion was an auxiliary factor directly captures this main thesis.

Step-by-Step Solution

1
Identify the structural pivot in the passage
Recognized that the word 'However' shifts the focus from the traditional view to the author's central argument.
Main idea questions require distinguishing the author's core claim from background context and counterviews.
2
Distinguish central thesis from supporting evidence
Identified that the mention of local financial networks serves as supporting evidence for why the traditional view overstates rail impact.
Supporting details explain or justify the main idea but do not encompass the entire scope of the passage.
3
Select the option that captures the overall primary claim
The statement identifying rail expansion as an auxiliary mechanism rather than a primary catalyst matches the conclusion of the passage.
The correct main idea statement must capture the overarching synthesis of the passage.

Key Concept

Distinguishing Main Idea from Supporting Evidence
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Distinguishing Main Idea from Supporting Evidence