Executive power of "necessary and proper"--Lincoln was able to legislate from the Oval by use of executive order and in this case as Commander in Chief of the army.
Lincoln used the Emancipation Proclamation as a means to control the message of the Civil War, boost morale, and target the Southern labor force. As Commander and Chief, he has able to make war decisions and as it was an internal rebellion all acts were done by his executive order.
President Abraham Lincoln issued the Emancipation Proclamation, whilst the third year of the bloody civil war was ongoing. The proclamation stated "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free." This allowed the Thirteenth Amendment to come along as well.
The french and british were struggling against the german war machine, and russia was already out of the game. so thus only 2 main powers were left, France and britian
