https://www.nytimes.com/2018/10/11/s...ogy-study.html
Relevant quote:
Already, 60 percent of Americans of Northern European descent — the primary group using these sites — can be identified through such databases whether or not they’ve joined one themselves, according to a study published today in the journal Science.
Within two or three years, 90 percent of Americans of European descent will be identifiable from their DNA, researchers found. The science-fiction future, in which everyone is known whether or not they want to be, is nigh.
My mistake. Not 90% of all Americans. The headline states most white Americans.