The Preamble:
We the people of the United States of America, in order to form a more perfect union, establish justice, ensure domestic tranquility, provide for the common defense, promote the genreal welfare and secure the blessings of liberty to ourselves and our posterity, do ordain and establish this constitution for the United States of America.
It states that they're going to provide freedom for the nation, provide support for our soldiers (I think that's what they mean by common defense), enforce laws, and basically make the nation just a peaceful, free land.
Let me know if this helps.
Answer: To engage the audience's feelings.
Explanation: Taken from the Acceptance Speech by Martin Luther King Jr. (1964), the phrase “I believe” is used several times in order to give pathos expressions in his speech, that is, to stir up emotions of hope through his words. Pathos is a very useful tool to persuade others and engage audiences in speeches or arguments. In fact, that was what Martin Luther King Jr. wanted to do, to demonstrate the great role that the Civil Rights movement played during that time.
"Give me back that notebook'
