In the 19th century, however, New York's economic power outpaced Boston's, fueled by possession of the terminus of the Erie Canal, which spurred massive growth in the manufacturing, shipping, insurance and financial services businesses. Another factor was its more rapid population expansion compared to that of Boston, driven by the growth of these industries, by New York's popularity as an immigration port of entry, and enhanced by a larger population base, even prior to the construction of the Canal – on the eve of the Revolution, New York, with 30,000 people, had nearly twice the population of Boston, with about 16,000. By the start of the 20th century the original dynamic, centered on Boston, had completely shifted as New York, particularly Wall Street, became the focus of American capitalism.