Final answer:
The summarized claim that Americans must unite as equals is best encapsulated by the foundational belief that 'all men are created equal', and the nation must embody the true spirit of this creed through respect, dignity, and justice for all.
Step-by-step explanation:
The phrase that best summarizes the speaker's claim that Americans must come together as equals is found in the assertion that "all men are created equal" and the nation should live out the true meaning of its creed. This principle is echoed in calls for unity amidst diversity, fighting against poverty, striving for peace among nations, and challenging the divides of wealth and race. The imperative for all to treat each other with respect and dignity, in order to realize the greatness of America, is a recurring theme in these passages.
The statements call for a universal unity that transcends racial, economic, and national lines, emphasizing the need for collective action to achieve the foundational American ideals of equality and justice. Moreover, it invites Christians and all Americans to embody the virtues of love and harmony, to correct past mistakes, and to stand in solidarity to eliminate racism and hatred in society.