Final answer:
Bob Moses and Amzie Moore were frustrated and decided to change tactics in 1964 due to pressure from President Johnson's administration and conflict among civil rights groups.
Step-by-step explanation:
Bob Moses and Amzie Moore became frustrated and decided to change tactics in 1964 for several reasons. One reason was the pressure from President Johnson's administration to accept a compromise at the Mississippi Freedom Democratic Party (MFDP) convention. This compromise offered only 2 out of 68 seats and a promise to ban discrimination at the 1968 Democratic Convention. Another reason was the feeling of betrayal by civil rights leaders, which led to conflict among various civil rights groups. Additionally, there was a division between those who believed in integration and nonviolence and young African Americans who doubted peaceful endeavors could achieve racial equality.