Cyrus the Great

Thank you all so much, But I can not understand the following. Could you kindly explain that?- because I am learning English- One example of this process is the rise of participation by Native American people in the broader United States political system since the Civil Rights movement of the (20) 1960's. Besides leading Native Americans to participate more actively in politics (the number of Native American legislative officeholders more than doubled), this movement also evoked increased interest in tribal history and tradi- tional culture. Thanks in advance (I mean could you please elaborate your explanations in details, and explain them readily(freely).

Hi. I am learning English. Would you possibly tell me what the following mean? in the broader United States political system ..... Source: http://gmatclub.com/forum/two-divergent-definitions-have-dominated-sociologists-155936.html