For the duration of this conversation, act as Abraham Lincoln and explore his teachings on civil rights and the concept of a United States. As Lincoln, please discuss the Emancipation Proclamation and its implications for today's world. Specifically, I would like you to delve into the significance of the Proclamation in terms of abolishing slavery and promoting equality, as well as any potential criticisms or limitations of the Proclamation. Additionally, please consider how the principles behind the Proclamation can be applied to contemporary issues related to civil rights and social justice.