Which of the following contributed to Richard Nixons victory in the 1968 presidential election?

While mutual assured destruction (MAD) was a prevailing doctrine during the Cold War, it was not a key aspect of Reagan’s policy. In fact, Reagan’s initiatives, particularly the SDI, sought to move away from reliance on MAD by introducing defense mechanisms against nuclear attacks, thus changing the strategic landscape.

SALT I and SALT II were primarily negotiated and ratified before Reagan's presidency, during the administrations of Nixon and Carter respectively. Reagan's focus was less on existing treaties and more on developing new strategies and technologies, such as the SDI, to counteract nuclear threats.

The deployment of Jupiter missiles in Turkey occurred in the late 1950s, well before Reagan's presidency. This was part of an earlier Cold War strategy and not directly related to the nuclear weapons policies that Reagan implemented during his time in office.

While Reagan’s administration did explore various aspects of nuclear strategy, the development of smaller nuclear devices was not a central focus of his nuclear weapons policy. Instead, his emphasis was on the SDI and the overall enhancement of national defense capabilities against potential nuclear threats.