Final answer:
Lyndon B. Johnson's theme for the country after John F. Kennedy's death was to continue the work of the Kennedy administration, focusing on tax reduction, civil rights, and antipoverty programs.
Step-by-step explanation:
After the assassination of John F. Kennedy, Lyndon B. Johnson's theme for the country was to continue the work of the Kennedy administration. Johnson aimed to maintain the liberal consensus based on tax reduction, civil rights, and antipoverty programs. He used the memory of Kennedy to gain support for controversial measures such as the 1964 Civil Rights Act. Johnson wanted to honor Kennedy's legacy and carry forward his vision for the nation.
Johnson's tenure was marked by his effective political maneuvering to secure legislative success, but also by contentious foreign policy choices, particularly the escalation of the Vietnam War. Despite these challenges, he made significant strides in civil rights and introduced social reforms aimed at eradicating poverty and promoting social welfare, which were cornerstones of his administration's agenda.