Evaluate the valence intensity of the following sentence, considering the mood of the author. Give a score between 0 and 1 inclusive, where 0 is the most negative and 1 is the most positive.
Sentence: In reality land ownership rights were the exclusive right of the Spanish, resulting in modern-day malappropriation of land ownership in the hands of the descendants of the Spanish colonialists (Warren 1978, 7-8). Indigenous peoples are commonly sharecroppers or migrant workers.