On Oct. 2, 1968, 10 days before the opening of the Summer Olympics in Mexico City, police officers and military troops shot into a crowd of unarmed students. Thousands of demonstrators fled in panic as tanks bulldozed over Tlatelolco Plaza. ... Thousands of students were beaten and jailed, and many disappeared.
<span>Prior to the Mexican American war president Polk sent John Slidell to Mexico to negotiate an agreement between that the Rio Grande River would be the southern border of Texas. ... The United States annexed the territory of California in 1848 following its victory in the Mexican-American War.</span>
Answer:limiting freedom in the united states
Explanation: