Reagan’s landslide victory in the presidential election of 1980 proved that
a. there were more republicans than democrats in the united states.
b. americans were ready for a change in leadership.
c. people wanted the government to reduce military spending.
d. americans did not cross party lines to vote in national elections.

b. Americans were ready for a change in leadership.

I learned this last year. It's 100% correct. :)

b. Americans were ready for a change in leadership.

Explanation:

The United States presidential election of 1980 highlighted a challenge between officeholder Democrat Jimmy Carter and his Republican adversary, Ronald Reagan, just as Republican Congressman John B. Anderson, who kept running as an autonomous. Reagan, helped by the Iran hostage emergency and a declining economy at home, won the decision in an avalanche. Carter, subsequent to overcoming Ted Kennedy for the Democratic assignment, assaulted Reagan as a perilous conservative radical.

As far as it matters for him, Reagan, the previous Governor of California, over and again derided Carter, and won a definitive triumph; in the concurrent Congressional races, Republicans won control of the United States Senate without precedent for a long time. This decision denoted the start of what is famously called the "Reagan Revolution."

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