Lincoln waited to unveil the proclamation until he could do so on the heels of a Union military success
D probably not quite sure
The most powerful was economic prosperity of European countries. They could exploit the land and the people of Africa and take their raw resources such as diamonds for example and take them to Europe. There they would be able to make goods with them and sell them to people for a lot of money and this meant that they would grow vastly richer than they were before.
Because his owner had died.
