The project, called V-Dem, or Varieties of Democracy, is an effort to precisely quantify global democracy at the country level based on hundreds indicators assessed annually by thousands of individual experts. It’s one of several ongoing projects by political scientists that have registered a weakening of democratic values in the United States in recent years.

V-Dem’s findings are bracing: The United States is undergoing “substantial autocratization” — defined as the loss of democratic traits — that has accelerated precipitously under President Trump. This is particularly alarming in light of what the group’s historic data show: Only 1 in 5 democracies that start down this path are able to reverse the damage before succumbing to full-blown autocracy.

“The United States is not unique” in its decline, said Staffan I. Lindberg, a political scientist at Sweden’s University of Gothenburg and a founding director of the project. “Everything we see in terms of decline on these indicators is exactly the pattern of decline” seen in other autocratizing nations, like Turkey and Hungary, both of which ceased to be classified as democracies in recent years.