Answer :
The policy Kennedy lay the groundwork for at the end of his presidency is détente
What is détente?
Détente is a communication techniques that is employed to ease tension especially to avoid argument or quarrel.
It involves communicating in a relaxed manner even difficult things.
Therefore, the policy Kennedy lay the groundwork for at the end of his presidency is détente.
Learn more on détente here,
https://brainly.com/question/1802354
#SPJ2