Why was Lincoln so slow in emancipating the slavers and why did he limit emancipation to only slaves in territory beyond control of the US (still ruled by the Confederacy)?

Historians interpret or explain historical facts, and the same facts might prompt different explanations based on the historian's analysis of the sources of information and the information itself — the facts. The sources and the data therein are sometimes called evidence. It is the historian's job to find as much relevant evidence as possible and to interpret or explain what happened based on that evidence. Your follow-up question is based on the text of Eugene H. Berwanger, "Lincoln's Constitution Dilemma: Emancipation and Black Suffrage," Journal of the Abraham Lincoln Association 5, no. 1 (1983), http://hdl.handle.net/2027/spo.2629860.0005.104/, as well as on what the textbook says about the topic, and any other scholarly source(s) you want. Answer one of these:

Answer in at least 250 words of substance, and add your source citations as Chicago-style footnotes