What made Empire's outside Europe rise and decline

That on the first day of January in the year of our Lord one thousand eight hundred and sixty-three all persons held as slaves within any state or designated part of a State. the people whereof shall then be in rebellion against the United states, shall be then thence forward and forever free; and the executive government of the United states, including military and naval authority the office will recognize and maintain freedom of such persons and will do not acts to repress such persons, or any of them in any efforts they may make for their actual freedom