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In page Wilmington, Delaware:

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By 1868, Wilmington was producing more iron ships than the rest of the country combined[citation needed] and it rated first in the production of gunpowder and second in carriages and leather. Due to the prosperity Wilmington enjoyed during the war, city merchants and manufacturers expanded Wilmington's residential boundaries westward in the form of large homes along tree-lined streets. This movement was spurred by the first horsecar line, which was initiated in 1864 along Delaware Avenue.