Final answer:
The three Party slogans are: Organization and Unity, Leadership for the 60s, and They understand what peace demands.
Step-by-step explanation:
The three Party slogans are:
- Organization and Unity: A slogan promoting the importance of organizing and uniting for victory over external enemies and internal construction.
- Leadership for the 60s: A slogan used by Kennedy in the 1960 campaign to highlight his leadership qualities and appeal to voters.
- They understand what peace demands: A slogan chosen by the Nixon ticket in the 1960 campaign to emphasize their understanding of the requirements for peace.