After the Revolution, Boston's long seafaring tradition helped make it one of the world's wealthiest international ports, with the slave trade, rum, fish, salt, and tobacco being particularly important.  Boston's harbor activity was significantly curtailed by the Embargo Act of 1807 (adopted during the Napoleonic Wars) and the War of 1812. Foreign trade returned after these hostilities, but Boston's merchants had found alternatives for their capital investments in the interim. Manufacturing became an important component of the city's economy, and the city's industrial manufacturing overtook international trade in economic importance by the mid-19th century. Boston remained one of the nation's largest manufacturing centers until the early 20th century, and was known for its garment production and leather-goods industries.  A network of small rivers bordering the city and connecting it to the surrounding region facilitated shipment of goods and led to a proliferation of mills and factories. Later, a dense network of railroads furthered the region's industry and commerce. 
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