...One nation, invisible.
( ... ( ( ( ( One nation ) , ) invisible ) . ) )
(ROOT (NP (: ...) (NP (CD One) (NN nation)) (, ,) (NP (JJ invisible)) (. .)))
The greatest nation.
( ( The ( greatest nation ) ) . )
(ROOT (FRAG (NP (DT The) (JJS greatest) (NN nation)) (. .)))