According to HNN:
In the early 1970s, the Nixon Administration plotted to interfere in Uruguay’s presidential elections in order to block the rise of the leftist Frente Amplio coalition. But when the State Department published its official history of U.S. relations with Latin America during the Nixon era last month, there was no mention of any such activities. Instead, the State Department Office of the Historian said that Uruguay-related records could not be posted on the Department website because of “space constraints.” Following repeated inquiries, however, the Historian’s Office revised its position last week and said it would include Uruguay-related records in its Nixon history after all.
But none of this concern over Uruguay could be discerned from the State Department’s official history of U.S. policy towards the region. A July 10, 2009 State Department press release announcing the publication of the latest online volume of the Foreign Relations of the United States (FRUS) on American Republics, 1969-1972, mentioned almost every Latin American country except for Uruguay. [TSB Note: see it here] The original Preface of the new FRUS volume (pdf) made the peculiar assertion that: “Due to space constraints, relations with… Uruguay… are not covered here.” This assertion is doubly strange since the new FRUS volume was only published online, not in hardcopy, so that “space constraints” are hardly a factor.
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But in a brief email message on July 30, FRUS Acting General Editor Dr. William B. McAllister wrote: “We have revised the Preface. This should clarify the situation.” The revised Preface to the new FRUS volume now states that a chapter on Uruguay “will be added” following completion of the declassification process. The newly revised Table of Contents includes a placeholder listing for Uruguay. There is no indication of what records may be declassified, or when they might become available.
All in all, this seems like a sign of good management at the new, improved, Office of the Historian.