WASHINGTON, June 13 -- Put the history back. That, in effect, is what a federal judge has ordered Donald Trump's administration to do, after it spent months stripping the national parks of signs and exhibits about slavery, climate change and Native Americans that the president had decided cast the country in too unflattering a light.

Judge Angel Kelley, of the US District Court for the District of Massachusetts, issued a preliminary injunction on Friday ordering the Interior Department and its National Park Service to reinstate, within three weeks, the materials they had taken down. The administration, she found, had engaged in what the Washington Post described as censorship, dismantling the public record by executive fiat.

The purge f...