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The Erie Canal's opening is the event that most directly contributed to the New York City's growth as the leading trade center of the nation. The Erie Canal connects the Great Lakes and the Atlantic ocean through the Hudson River. 

Answer:

Building and opening of Erie canal

Explanation:

Erie Canal was officially opened on October 25, 1825. It linked Lake Erie and all the Great Lakes to the Hudson River and New York. Construction on the canal began in 1816. The canal spanned 363 miles, and its completion helped to speed up the development of the West.

The Erie Canal was first opened in 1825. It was significant because it connected Lake Erie and the Great Lakes system to the Hudson River, and thereby gave the western states direct access to the Atlantic Ocean without shipping goods downstream on the Mississippi River to New Orleans.