The United States wanted to build a canal across the Central America, as it needed an easier and faster way to get goods from coast to coast. Hence, option D holds true regarding American coast.
What is the significance of American Coasts?
The coasts of North America and South America were separated by the islands and small parts of land located in the Central American region. This was the only way to commute between the coasts in either regions.
In order to build better and efficient transportation and commute network between these regions, the need for building canals through these regions emerged during the 1800s.
Hence, option D holds true regarding American coasts.
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