After reading through the "American Indian Civil Rights”, the sentence that best describes the conflict the author develops in the text is: "Most experts agree that is was over ten thousand years ago, well before European settlers began exploring this region of the world."
In terms of concussion rates per 1000 exposures, the girls' high school sports with the highest rates of concussions are soccer (0.36), basketball (up to 0.21), and lacrosse (0.20).