Final answer:
Carter's speech was pessimistic while Gorbachev's speech was optimistic about the current state of things.
Step-by-step explanation:
A contrast between Carter's speech and Gorbachev's speech can be seen in the fact that Carter is pessimistic about the current state of things, while Gorbachev is optimistic. In his speech, Carter warned of a 'crisis of confidence' and outlined the challenges that the nation was facing. On the other hand, Gorbachev's speech focused on political openness and economic restructuring as steps towards a better future.