Final answer:
The opening of our national market was facilitated by the development of transportation infrastructure, such as the transcontinental railroad. It allowed for the movement of goods and people across the country in a more efficient manner, benefiting businesses and consumers.
Step-by-step explanation:
In the context of the United States, the opening of our national market was largely facilitated by the development of transportation infrastructure, particularly the transcontinental railroad in the late 19th century. This allowed for the movement of goods and people across the country in a much more efficient and cost-effective manner. It enabled businesses to expand and reach new markets, and consumers to access a wider range of products.
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