Final answer:
The brutal events of Bloody Sunday during the Selma Campaign, including violent attacks on peaceful protestors, led President Johnson to delay and then urgently advocate for the Voting Rights Act of 1965 to protect and ensure the voting rights of African Americans.
Step-by-step explanation:
President Johnson postponed the Voting Rights Act of 1965 in part due to the events that transpired in Selma, Alabama.
This included the notorious incident on March 7, 1965, known as Bloody Sunday, where over 600 peaceful protestors marching for voting rights were brutally attacked by Alabama State Troopers as they attempted to cross the Edmund Pettus Bridge.
The violent response to the peaceful Selma Campaign and other events in Selma, including the killing of a demonstrator and the arrest of over 2,000 African Americans, ultimately galvanized national attention and accelerated the passage of the Voting Rights Act, which aimed to eliminate discriminatory practices such as literacy tests and to ensure federal oversight of elections, particularly in states with a history of voter suppression.