Lincoln's entire career from his very first political speech revolved around instituting a national bank, a tariff system, and a industrial subsidies. It was known as the American System.
Seriously, read up on it. It was his life's work. So, was he genuinely anti-slavery, or was he merely interested in breaking the South so that he could institute his system? His statements on blacks and his intention to deport them to the wilds of Africa seems to indicate that he wasn't altruistically interested in the welfare of the black man.
That won't be on the gov't mandated HS standards tests for brainwashing future generations, so why would a HS teacher who buys the gov't line of BS want to read such a thing? It might require actually critical thought...
