Mayor Pete given a history lesson on the founders opposition to slavery

PJ Media:

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However, Buttigieg was entirely off base to suggest the Founders did not understand the evils of slavery. In fact, many of them acknowledged the evils of slavery, but they compromised in order to hold the new nation together. As Matt Spalding wrote for the Heritage Foundation, "Those who founded this nation chose to make practical compromises for the sake of establishing in principle a new nation dedicated to the proposition that all men are created equal."

Ted Cruz rebuked Buttigieg by posting a string of direct quotes from the Founders.

"Slavery is an evil of Colossal magnitude & I am utterly averse to the admission of slavery into the Missouri Territories. It being among my first wishes to see some plan adopted by which slavery in this country may be abolished by law," Cruz quoted from John Adams, a Founding Father and the second president.

"Freedom is not a gift bestowed upon us by other men, but a right that belongs to us by the laws of God and nature," he quoted from Benjamin Franklin, who was a member of an abolitionist society. "Neither my tongue, nor my pen, nor purse shall be wanting to promote the abolition of what to me appears so inconsistent with humanity and Christianity."

2/x “Freedom is not a gift bestowed upon us by other men, but a right that belongs to us by the laws of God and nature.” Benjamin Franklin, founding father, abolitionist

— Ted Cruz (@tedcruz) December 31, 2019

"Who talks most about freedom and equality? Is it not those who hold a bill of Rights in one hand and a whip for affrighted slaves in the other?" Cruz quoted from Alexander Hamilton, an abolitionist and the first secretary of the Treasury.

"It is much to be wished that slavery may be abolished," John Jay, the first Chief Justice of the Supreme Court, wrote. "The honor of the States as well as justice and humanity, in my opinion, loudly call upon them to emancipate these unhappy people. ... To contend for our own liberty, and to deny that blessing to others, involves an inconsistency not to be excused."

6/x “To contend for our own liberty, and to deny that blessing to others, involves an inconsistency not to be excused.” John Jay, founding father, first Chief Justice of the Supreme Court, abolitionist

— Ted Cruz (@tedcruz) December 31, 2019

The Northwest Ordinance, one of the very first laws passed under both the Articles of Confederation and the Constitution, explicitly excluded slavery from the Northwest Territory, which would become the states of Wisconsin, Michigan, Illinois, Indiana, Ohio, and part of Minnesota. This set the precedent that slavery would not be allowed to expand into federal territories, setting the stage for a debate that would escalate into the Civil War.
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The compromise they made led to the abolishing of the slave trade in 1808.  They had earlier sought to get King George to abolish it before the American revolution.  Mayor Pete is not the only one on the left who does not know the history of the founders.