How did the Voting Rights Act of 1965 change the demographics of the two major American political
parties?

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.

Sir thomas more, venerated in the catholic church as saint thomas more, was an english lawyer, social philosopher, author, statesman, and noted renaissance humanist. he was also a councillor to henry viii, and lord high chancellor of england from october 1529 to 16 may 1532. i found this information on wikipedia