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In page Erie Canal:
"Freight traffic reached a total of 5.2 million short tons (4.7 million metric tons) by 1951. The growth of railroads and highways across the state, and the opening of the St. Lawrence Seaway in 1959, caused commercial traffic on the canal to decline dramatically during the second half of the 20th century. Since the 1990s, the canal system has been used primarily by recreational traffic.[citation needed]
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