The Tax Foundation, an independent tax policy nonprofit, reports that in a coordinated effort, lawmakers in seven states that collectively house about 60 percent of the nation’s wealth — California, Connecticut, Hawaii, Illinois, Maryland, New York and Washington — introduced wealth tax legislation. The campaign is part of a broader national focus on new taxes on investment, entrepreneurship and wealth. The proposals include taxing unrealized capital gains and expanding estate taxes. In some states, lower estate tax thresholds would impose the tax on the upper middle class and not just the very wealthy, including the small businesses and farms policymakers have long worked to protect from estate taxes to avoid forcing them to break up to pay the tax. And the wealth taxes themselves would vary across the seven states, partly due to differing state constitutional constraints.