In fact, they haven’t voted majority D since, you guessed it, the civil rights act was signed.

By state, that’s clearly untrue. Vermont and Massachusetts and Minnesota and Oregon would be blood-red if the split was purely racial.

This is a very regionalized phenomenon and heavily predicated on the way governors and state legislatures have historically dictated enfranchisement.

they are actively choosing this every election cycle

In 2008, Obama enjoyed a slight majority of support over McCain among white voters. And that’s without discussing the landslide support he saw in the Midwest relative to Clinton.

There’s also a strong youth vote trend that favors progressive politicians, even (perhaps especially) among white voters. Meanwhile, older Black and Asian and Hispanic voters lean conservative relative to their ethnic mean.

Even then, voter participation in the US is abysmal - hoovering in the 50-70% range. To crib from Beto O’Rourke’s favorite lines, America isn’t a conservative country, its a non-voting country. White people aren’t choosing, any more than their colored peers. They are having their politicians pre-selected and force-fed to them by a handful of wealthy, ideological radicals. This leads to some of the worst approval ratings for elected representatives in the world.