An insightful article on ethnic identity is at Vanishing American.
The article linked says that the petitioners are arguing that having ethnic identity is against democracy. However, one could argue the opposite.
A democracy requires that the rulers are of the same ethnicity and religion as the ruled. If this condition is violated, there is no real democracy. This is because the rulers won’t make decisions the same way the people would, so they don’t represent them if they are different.
This requires a single ethnic religious group as the population of a country.
A second requirement for democracy is a limit on income inequality. This also is needed for those who run institutions to make decisions the same way that the people impacted would make the decisions. For example, in setting tuition.
What we have in the US is more like a hostile ethnic plutocracy over a White Christian population being pushed down.
Income inequality was lowest around 1776 and fell to a local minimum around 1970 before immigration raised it again.