Answer:
Delegates from New England were concerned about the new territories being added to the United States primarily due to the issue of slavery. As new territories were acquired or created, there was a growing debate over whether slavery would be allowed in these regions.
New England, particularly in the years leading up to the Civil War, had become increasingly abolitionist in sentiment. Many delegates from this region were strongly opposed to the expansion of slavery into new territories. They feared that allowing slavery in these areas would not only perpetuate the institution of slavery but also upset the delicate balance of power between free and slave states in the Union.
Furthermore, the addition of new slave-holding states could potentially strengthen the political influence of pro-slavery factions in Congress, which would have been detrimental to the interests of New England states and their anti-slavery stance.
In summary, the concern of New England delegates regarding the new territories being added to the United States revolved around the spread of slavery and its potential implications for the country's future and moral character.
Explanation: