Final answer:
The legislation that was passed after the murder of civil rights workers and the march across the bridge is the Voting Rights Act of 1965. It aimed to overcome barriers that prevented African Americans from exercising their right to vote.
Step-by-step explanation:
The legislation that was passed after the murder of civil rights workers and the march across the bridge is the Voting Rights Act of 1965. This act was signed into law by President Lyndon B. Johnson and aimed to overcome barriers that prevented African Americans from exercising their right to vote, such as literacy tests and poll taxes. It prohibited states and local governments from passing laws that discriminated against voters on the basis of race. The act had a significant impact on increasing African Americans' access to the voting booth.