3short questions for this paragraph asap
". now, therefore i, abraham lincoln, president of the united states, by virtue of the power in me vested as commander-in-chief, of the army and navy of the united states in time of actual armed rebellion [civil war] against the authority and government of the united states, and as a fit and necessary war measure for suppressing [stopping] said rebellion, do, on this first day of january, in the year of our lord one thousand eight hundred and sixty-three, and in accordance with my purpose so to do publicly proclaimed for the full period of one hundred days, from the day first above mentioned, order and designate as the states and parts of states wherein the people thereof respectively, are this day in rebellion against the united states, the following, to wit: . .

and by virtue of the power, and for the purpose aforesaid, i do order and declare that all persons held as slaves within said designated states [those states in rebellion], and parts of states, are, and henceforward shall be free; and that the executive government of the united states, including the military and naval authorities thereof, will recognize and maintain the freedom of said persons. . "

according to this document:

-what was president abraham lincoln hoping to achieve by issuing the emancipation proclamation?

-by what authority and upon what grounds does lincoln issue the emancipation proclamation? and do you agree or disagree with him that he actually has the authority to do this or is he stretching his powers beyond what he is given? explain your answer.