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Answer:
That they should not claim colonies in the Americas
Explanation:
On 2 December 1823, President James Monroe of the United States of America while addressing the Congress articulated that European powers should acknowledge Western hemisphere a the United States sphere of interest. This is called as Monroe Doctrine and had great influence in the United States foreign policies in the years to come. The interference in the puppet government of Mexico, crises in Cuba were seen as a result of this doctrine.
They most strongly disagreed on whether or not slavery would continue to exist in the south.
Lincoln used to express moral opposition to slavery in public and in private. He attempted to stop the expansion of slavery and proposed compensated emancipation at the beginning of his presidency. Later, he stated that slavery should not be allowed to expand any more U.S. territories.
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