Which of the following statements best summarizes the system of railroads shown on the map?

A.
The majority of the railroads that connected the North to the South were built by 1850.

B.
The railroads established by 1860 each began and ended at a major American city or port.

C.
The primary direction of the railroads built between 1850 and 1860 was north to south.

D.
The extent of the railroads in the South was very limited compared to that of the North.

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D. The extent of the railroads in the South was very limited compared to that of the North

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D. The extent of the railroads in the South was very limited compared to that of the North.

To determine the best summary of the system of railroads shown on the map, we need to analyze the map and consider the information provided. Here's how to go about it:

1. Study the map: Examine the map closely and identify the key features related to the railroads. Look for patterns, directions, and connections.

2. Analyze the timeline: Pay attention to the timeline provided in the question, which indicates the timeframe between 1850 and 1860.

3. Consider the distribution: Look for any indications of where the majority of the railroads were built, and whether they are concentrated in a specific region or direction.

4. Evaluate the reach of the railroads: Determine the extent to which the railroads extend in different parts of the country, particularly in the North and the South.

Based on this analysis, we can now evaluate each statement to find the most accurate summary:

A. The statement suggests that the majority of the railroads connecting the North and the South were built by 1850. However, the given timeline specifies the period as between 1850 and 1860, so we can eliminate this option.

B. This statement indicates that the railroads established by 1860 each began and ended at a major American city or port. However, it doesn't provide information about the overall distribution or direction of the railroads, so we can eliminate this option as well.

C. This option implies that the primary direction of the railroads built between 1850 and 1860 was north to south. This statement aligns with the given time frame and suggests a clear direction for the majority of the railroads. We will consider this option as a potential answer.

D. The statement states that the extent of the railroads in the South was very limited compared to that of the North. While this option notes a discrepancy in the distribution, it does not provide information about the direction or the timeline, so we can eliminate this option.

Based on the analysis and elimination process, the statement that best summarizes the system of railroads shown on the map is C. The primary direction of the railroads built between 1850 and 1860 was north to south.