Final answer:
Electric streetcars revolutionized city growth by enabling expansion and the development of segregated neighborhoods along streetcar lines.
Explanation:
Electric streetcars are an example of technology that significantly impacted the growth of cities by allowing people to live farther from work as long as they were near a streetcar line, leading to the development of streetcar suburbs. These suburbs were often segregated by ethnicity and race. The introduction of electric streetcars caused a shift from walking cities to larger, more spread-out urban areas.
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