3. Whigs opposed the concept of Manifest Destiny because A. they did not want to conquer Native American land.
B. they focused more on industry than agriculture
C. they feared Mexico's military strength.
D. they preferred to develop existing U. S. land over acquiring new territory.

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explanation:

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the right answer is the third one: turnpikes went short distances to connect markets. turnpikes, also known as toll roads, were very important for trade and transportation (of people, goods and products) in the 19th century, coinciding with the expansion towards the west. they contributed significantly to the economic development of the united states.