Part A:

Read this sentence from paragraph 3 of the speech.

For the cries of pain and the hymns and protests of oppressed people have summoned into convocation all the majesty of this great Government - the Government of the greatest nation on earth.

Based on this sentence, the word convocation suggests the idea of a gathering that is -

Responses

held by only government officials

protested by the majority of America

held as unique to the United States

conducted in a formal setting