Beginning in the 1960s, voter demographics between the democrat and republican parties shifted. before this time, the south was democratic. the south began shifting toward the republican party following the 1964 civil rights act. which of the following explains why this trend occurred?

The democratic party became the party of civil rights because Lyndon B. Johnson, the president who signed the 1964 Civil Rights Act into law, was a democrat.

Explanation:

Southern Democrats opposed civil rights legislation, for example, southern democrat Strom Thurmond from South Carolina gave a 24 hour speech to try to fillibuster the bill in the Senate.

After the bill became law, most southern democrats switched to the Republican Party, as well as the electoral base. Partisanship was not as strong druing the 1960s, 1970s, or 1980s, but in recent decade it has become stronger, making the Southern United States a bastion of the Republican Party.

it provided for equal trade rights among nations in china.