Nixon 1972 vs. Reagan 1984 by state

[President Johnson]

I had some time left during lunchbreak today, so I compared vote shares of Nixon in 1972 and Reagan 1984 by state. This map shows who received a higher share of votes in each state:
 

Red = Nixon in 1972 received a higher voter share than Reagan in 1984
Blue = Reagan in 1984 received a higher voter share than Nixon in 1972
 

In both 1972 and 1984 electoral votes, Tricky Dick wins comfortably. However, he won two percent more than Reagan in the national popular vote (60.7% vs. 58.8%).

Nebraska was extremely close, seperating both results by just 0.05% as Reagan received 70.55% and Nixon 70.50%.
 
Nixon's margins in the South were just insane. He cracked 70% in some of them. In Georgia, he won 75% of the vote and every county, but four years later Jimmy Carter won 66% of the vote and also every county. Reagan received 60% in 1984, while losing the state in 1980.

[President Johnson]

In the South civil rights was still a current issue and black voter registration was still poor.

Agreed, though it's pretty ironic that Nixon's administration actually implemented desegregation policies begin under the Johnson presidency. Nixon also supported civil rights longer than a number of others, as early has his tenure under Eisenhower. His Justice Department even sued the Trump Organization in 1973 for violating the Fair Housing Act.