Evaluate the arousal intensity of the following sentence, considering the mental state of the author. Present a score between 0 and 1, where 0 denotes extremely calm and 1 denotes extremely energetic.
Sentence: Mayans gained formal recognition in 1995 as the majority population in a precursor to the 1996 peace accord; by 1999 its government floated a referendum on an indigenous bill of rights resembling that codified in the Colombian constitution (Warren 2002: 157-158).