The problem that Lincoln saw in the emancipation proclamation was that it was not mostly welcomed by the southerners.
Step-by-step explanation:
There was a rumor which highlighted that Lincoln would mount an attack on slavery but it was denied and he also insisted that he would restore the union. he proclaimed the negro emancipation is a necessary political event which must happen. During the civil war, the south economy was based on slavery and plantations were filled with slaves who toiled hard for the economy of the south to stabilize.
The factor of industrialism could not achieved if slaves were freed. The Union also complained that this document is dictating lenient terms towards the south. It was actually a strategy to weaken the south by back lashing them on the important aspect of growth for their economy and that was slavery.