King evokes what type of appeal in his audience by mentioning the various historical documents, such as the Emancipation Proclamation, the Declaration of Independence, and the Constitution?

Ethical appeal (Ethos)

Logical appeal (Logos)

O Emotional appeal (Pathos)

Logical appeal (Logos)

Explanation:

Logical appeal, also known as Logos is one of the three modes of persuasion that appeals to logic or reason. To support an argument using logos, facts, statistics, and history are referenced. In the Speech, "I have a Dream", by Martin Luther King, the Emancipation proclamation by Abraham Lincoln which was declared 100 years ago, was referenced at the onset of the speech and this served as a logical appeal to history.  

The Declaration of Independence and the Constitution were also references to history aimed at supporting King's arguments.

glamis thou art, and cawdor; and shalt be what thou art promis'd; yet do i fear thy nature; it is too full o' the milk of human kindness to catch the nearest way: thou wouldst be great; art not without ambition; but without the illness should attend it. what thou wouldst highly, that wouldst thou holily; wouldst not play false, and yet wouldst wrongly win: thou'dst have, great glamis, that which cries, "thus thou must do, if thou have it: and that which rather thou dost fear to do than wishest should be undone." hie thee hither, that i may pour my spirits in thine ear; and chastise with the valor of my tongue all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal.  

he lacks ambition.  

he is hesitant.  

he lacks courage.  

he has moral scruples.

people are gonna need the passage.