For now, civil society in the US looks divided, and that is a problem.
Has the incoming Biden administration or the Democratic party expressed any specific policies or plans for the purpose of addressing this issue?
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Yes, the Democratic Party Platform for the 2020 elections contains a section entitled "Healing the Soul of America", which begins:
Democrats believe in bringing the American people together, not stoking division and distrust. President Trump has denigrated virtually every segment of American society—and in so doing, he has insulted the very idea of America itself. Healing the soul of America means facing up to the deepest inequities in our society, from structural racism to misogyny to discrimination against people with disabilities, and enacting ambitious measures to fix them.
The full section is far too long to reproduce here, but it includes commitments to "use federal law enforcement tools and resources to address domestic terrorism", as well as a promise to "ensure federal data collection and analysis is adequately funded and designed to allow for disaggregation by race and ethnicity, among other important factors, to better design policies to address the needs of the most vulnerable communities and make informed policy choices".
This section seems to cover the majority of the Democratic Party position on the race and gender points from the link in the question, but on the issue of the economy, the section entitled "Building a Stronger, Fairer Economy" seems more relevant, focusing on the issues of intergenerational mobility as well as the "persistent, pernicious racial wealth gap". This section contains promises such as a raise in the federal minimum wage, as well as tax-credits for first-time homebuyers as part of their goal to "address long-standing economic and racial inequities in our housing markets".
There’s nothing the Biden administration or the Democratic Party can do except govern as effectively as possible, which is going to be difficult at best because of bad actors in Congress and the news media.
We’re seeing the end result of decades’ worth of grievance and misinformation pushed by talk radio, certain cable news networks, and other alternate news sources. With the democratization of media made possible by the Internet, there’s no effective gatekeeping to stop disinformation and propaganda from being disseminated.
The downside of a free press is that we have no good way of stopping anyone from just making stuff up and publishing it as news, at least not without running afoul of the 1st Amendment and a couple of centuries of case law.
The other problem is that we citizens treat politics as a reality show and elect performative jackasses who have no ability or desire to actually govern.
This isn’t a top-down problem with a top-down solution. In a democracy, you get the government you deserve.