Whereas, on the twenty-second day of September, in the year of our Lord one thousand eight hundred and sixty-two, a proclamation was issued by the President of the United States, containing, among other things the following, to wit: –Emancipation Proclamation,

Abraham Lincoln

What does the term "proclamation" mean in this context? Check all that apply.

an official public announcement
a legal declaration
an advertisement
a testimony
a publication