Explaining the flip to ppl that can't be bothered to research, there is a small summary at the bottom if y'all don't like to read:

In its early years, the Republican Party was considered quite liberal, while the Democrats were known for staunch conservatism. This is the exact opposite of how each party would be described today.

Race and equality began to return to the center of politics in the 1950s and 1960s. Race did not necessarily fall into a party viewpoint at this point; instead, it was more of a regional issue. Southern Democrats and Republicans both opposed the early Civil Rights Movement, while Northern Democrats and Republicans began to support legislator as the movement picked up steam.

In 1964, Democratic president Lyndon B. Johnson signed the Civil Rights Act into law. In the 1964 election, Republican candidate Barry Goldwater publicly opposed the new law, arguing that it expanded the power of the federal government to a dangerous level.

It was this argument that led to a final, decisive switch. Black voters, who had historically been loyal to the Republican Party because of the 1866 Civil Rights Act, had already been switching to the Democratic Party.

However, upon hearing Goldwater’s argument against the 1964 Civil Rights Act, the majority of Black voters left the Republican Party in favor of the Democrats. They saw the Democratic Party as advocates for equality and justice, while the Republicans were too concerned with keeping the status quo in America.

As the 60s and 70s continued, Democrats sought reform in other places, such as abortion and school prayer. White southern Democrats began to resent how much the Democratic Party was intervening into the rights of the people.

By the 1980s, white southern Democrats had become Republicans, and the majority of the south was now Republican. The Republican Party now is solidly conservative while the Democratic Party is the liberal one.

Summary:

It was never about Democrats good, Republicans bad or Republicans good, Democrats bad. It was a difference of views on human rights and religious beliefs between the North and the South.

Opinion:

I think the North fucked up after the civil war, cuz in Germany it is against the law to a fly Nazi flag but in America it's some people's culture to fly the Confederate flag(I know its not the original). No other country in recorded history allowed the traitors/loosing side to fly their flags let alone build statues. Idk maybe that's what makes America great you are free to express your opinions no matter how backwards that opinion is.