Answer:
Anaphora "It ought to be possible" to emphasize the lack of equality.
Step-by-step explanation:
Anaphora is referred to as the literary device using repetition of certain phrases to emphasize the implied message and convey it more effectively. In this excerpt, President Kennedy highlights the inequality and injustice experienced by black Americans by using "Anaphora". She repeats the phrase "it ought to be possible" several times in this excerpt to urge the audiences to lay the foundation of an America which is free from 'Racial segregation' and where all the Americans would be treated with equal services at every place. She uses "ought to" that suggests 'the right thing to be done' and i.e. implicit of the liberty to live life, right to vote and equal treatment with all the privileges to all the Americans(including the African-American) which is of prime importance to her.