An important part of U.S. diplomacy is getting sovereign states to work together voluntarily.
( ( ( An ( important part ) ) ( of ( U.S. diplomacy ) ) ) ( ( is ( ( getting ( sovereign states ) ) ( to ( ( work together ) voluntarily ) ) ) ) . ) )
(ROOT (S (NP (NP (DT An) (JJ important) (NN part)) (PP (IN of) (NP (NNP U.S.) (NN diplomacy)))) (VP (VBZ is) (VP (VBG getting) (NP (JJ sovereign) (NNS states)) (S (VP (TO to) (VP (VB work) (ADVP (RB together)) (ADVP (RB voluntarily))))))) (. .)))
It's not important for states to work together.
( It ( ( ( ( 's not ) ( important ( for states ) ) ) ( to ( work together ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (RB not) (ADJP (JJ important) (PP (IN for) (NP (NNS states)))) (S (VP (TO to) (VP (VB work) (ADVP (RB together)))))) (. .)))