Colonial Boston’s wealth is often pictured through its wharves, merchants and handsome brick houses. Behind that picture lay a trading relationship that sustained the town for more than a century: commerce with the sugar-producing colonies of the West Indies. New England did not grow sugar, but it supplied the islands that did, and the profits shaped Boston’s economy, its merchant class and its politics. That trade was also inseparable from slavery, a connection historians increasingly place at the center of the story.
A Colony Without a Staple Crop
Unlike Virginia with its tobacco or the Caribbean islands with their sugar, Massachusetts lacked a valuable staple crop that England wanted. Its rocky soil and short growing season supported farming for local needs, but little for export to Europe. Yet the colony needed a way to pay for manufactured goods, tools, cloth and other imports from England.
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The solution emerged early. By the 1640s, New England merchants had discovered that the sugar islands, especially Barbados, needed exactly what New England could produce.
What the Islands Needed
As sugar cultivation expanded on Barbados and later on Jamaica, Antigua and other islands, planters devoted nearly all available land to cane. That left the islands dependent on outside sources for food, building materials and other necessities. New England filled the gap, shipping:
- Fish, especially dried and salted cod. The highest-quality fish went to markets in southern Europe, while lower grades, often called “refuse fish,” were sold to the Caribbean, where planters bought them as cheap food for enslaved workers.
- Timber products, including lumber, shingles and barrel staves, essential for building and for the casks used to ship sugar, molasses and rum.
- Livestock, particularly horses, which powered sugar mills on some islands.
- Provisions, such as grain, flour, beef and pork.
What Came Back
In return, Boston ships carried home sugar, molasses, rum, cotton, dyewoods and, crucially, money and credit. Payments in coin or bills of exchange could be used to settle debts with English merchants, helping New England pay for its imports.
Molasses became especially important. New England distilleries, including many in Boston and in Rhode Island, turned it into rum, which was consumed locally, sold to other colonies, used in the fisheries and traded abroad, including on the coast of West Africa.
The Myth and Reality of the “Triangle”
This commerce is sometimes described as a neat “triangular trade” linking New England, Africa and the Caribbean. Historians caution that the reality was more complex. Most voyages involved two-way shuttles between New England and the islands, or more intricate routes touching several ports. A smaller number of voyages did follow the pattern of carrying rum to Africa, enslaved people to the Caribbean and molasses back to New England. Rhode Island merchants were the most heavily involved New England participants in that direct slave trade, but Boston merchants took part as well.
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An Economy Bound to Slavery
Even when Boston ships did not carry enslaved people, the West Indies trade depended on slavery at every step. The sugar islands were built on the forced labor of enslaved Africans, who endured brutal conditions and high death rates. The fish, provisions and barrels New England supplied fed the enslaved workforce and kept the plantations running. The molasses and sugar that flowed back north were products of that labor.
Slavery also existed in Massachusetts itself. Enslaved Africans were present in the colony from at least the 1630s; the colony’s 1641 legal code, the Body of Liberties, included language that permitted certain forms of slavery. Some early captives taken in wars with Native peoples were sold into slavery in the West Indies. Enslaved people worked in Boston households, shops, wharves and ships throughout the colonial period, and Boston newspapers carried advertisements for sales and runaways.
Prominent Boston merchants participated in this economy. Peter Faneuil, whose gift gave the town Faneuil Hall in 1742, was among merchants whose businesses included trade linked to slavery.
Building a Merchant Class
The West Indies trade created many of the fortunes that defined colonial Boston’s elite. It also supported a wide network of occupations: shipbuilders, sailmakers, ropemakers, coopers, sailors, dockworkers, distillers and clerks. Wharves, warehouses and counting houses lined the waterfront, and Long Wharf, extending far into the harbor, became the symbol of Boston’s commercial ambition.
The trade also connected Boston to the wider Atlantic world, bringing news, goods and ideas, and making the town a hub for shipping throughout New England.
Trade, Taxes and Smuggling
As the trade grew, so did conflict with imperial regulation. British law favored British West Indian planters, and Parliament passed the Molasses Act in 1733, placing a heavy duty on molasses from French and other foreign islands, which were often cheaper. New England merchants largely evaded the duty through smuggling, and enforcement was lax for decades.
When Parliament passed the Sugar Act in 1764, it actually lowered the duty but paired it with much stricter enforcement. Boston merchants saw it as a threat to their livelihoods, and opposition to it became one of the early sparks in the conflicts that led to the Revolution.
The End of Slavery in Massachusetts
Slavery in Massachusetts ended through a combination of legal challenges and changing public opinion in the 1780s. Freedom suits brought by enslaved people, including Elizabeth Freeman and Quock Walker, led courts to rule that slavery was incompatible with the new state constitution of 1780. By the time of the first federal census in 1790, no enslaved people were recorded in Massachusetts. Yet the state’s economic ties to slavery continued long after, through trade and, later, through textile mills that depended on cotton grown by enslaved people in the American South.
Remembering the Full Story
For many years, histories of Boston’s commercial rise emphasized enterprise, shipbuilding and seafaring skill while giving little attention to slavery. Today, museums, historians and public sites increasingly present a fuller account that includes the enslaved people whose labor made the system possible, both in the Caribbean and in Boston itself.
Understanding how Boston’s early prosperity was built, including its painful foundations, is part of how the city continues to reckon with and reinvent itself.
Quick check: Why did Caribbean sugar islands depend on New England for food and timber?
- The islands had no harbors
- Planters devoted nearly all land to sugar cane, leaving little for food or lumber
- British law banned farming on the islands
Show answer
B. Sugar monoculture made the islands reliant on imports, and New England supplied fish, provisions and timber for a plantation system built on slavery.