Answer:
The speaker is saying this to America.
Step-by-step explanation:
The given line is taken from the poem "For You O Democracy" by Walt Whitman. The poet in this poem is making promises to his nation, America, for making it a better nation, better citizens, etc.
In the given line, the speaker is talking to America, his nation. He is making a promise to his nation of making it an indissoluble continent.