Final answer:
Improvements in ship design, demand for whale oil, and expanded trade to Asia were factors that played a role in the expansion of US trade in the mid-1800s.
Step-by-step explanation:
In the mid-1800s, several factors contributed to the expansion of US trade. Improvements in ship design allowed for more efficient transportation of goods, making trade more profitable. The demand for whale oil, which was used for lighting, also played a role in trade expansion. Additionally, expanded trade to Asia, particularly with countries like China, opened up new markets for American goods.
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