More African-American joined the Democratic Party while the Republican Party lost a lot of white supporters in the South.
Explanation:
After the passage of the Voting Rights of 1965 by President Johnson, there was a significant increase in the number of minority and African-Americans voters.
The newly registered African-American voters inclined more towards the Democratic Party leading to a massive increase in its supporters. On the other hand, the Republican lost a lot of white supporters in the South.
This was mainly because of the adoption of Richard Nixon's “Southern strategy” by the Republican Party.
