Unfortunately for your rosy thesis the Slavers were bound and determined that slavery not end. That is EXACTLY why they started the war.
Ignorant Maroon .
That the United States did not establish slavery in North America, we ended it, is not a thesis. It is a fact.
And by selecting the boneheaded issue of slavery, they did irreparable damage to the 10th amendment. As stated, the danger came from within.
Regardless what the pro-slavery people wanted, slavery wouldn't have lasted.