The first statement is the most accurate: "While the Reconstruction Amendments guaranteed equal rights in the U.S., obstacles to voting and education were used to limit the use of those rights." This reflects the reality that, despite constitutional protections, many groups, including African Americans and Mexican Americans, faced significant barriers that impeded their ability to fully exercise their rights.
The second statement inaccurately suggests that Mexican Americans had more expansive rights than Black Americans, which is an oversimplification. Both groups faced systemic discrimination and barriers to equal rights.
The third statement is incorrect because the Reconstruction Amendments did not eliminate all obstacles to equality; discriminatory practices persisted for decades.
The fourth statement contains some truth regarding the Emancipation Proclamation and ongoing struggles for Mexican Americans, but it downplays the continued fight for civil rights by African Americans and inaccurately frames the Emancipation Proclamation as a comprehensive solution.
Thus, the correct response is the first statement.