D. The Speaker of the House.
While technically it would be the Vice President, he does not usually spend anytime at the Capitol, so it would be the speaker.
The Civil Rights Act of 1964, which ended segregation in public places and banned employment discrimination on the basis of race, color, religion, sex or national origin, is considered one of the crowning legislative achievements of the civil rights movement.
<em>I think it is A.. Hope this helped :)</em>
American settlers, Native Americans, and Mexican Americans faced some conflicts in the Mexico cession. They all faced legal, economic, and social discrimination problems.
In short, conflicts over land and water.
Good luck :)