The word seminal means that an idea influences later generations.
So, it is unlikely that most editorials rise to the level of being so influential that they influence later generations.
There are exceptions to this, especially in the realm of Foreign Affairs, where people publish opinion essays that became the foundation of new thinking.
The correct answer to this open question is the following.
A seminal document is that kind of document that provides new or innovative ideas or concepts that transcends the test of time. It could be scientific information or historical information. In the case of historical documents, it could be documents, papers, speeches, acts or decrees that were so important that change the historical moment in a country or shaped the nation.
An editorial is the opinion of the newspaper, the TV network or any news broadcasting system on any topic of interest. The editorial is part of journalism in the opinion genres that mark the posture of the Editors on an important topic. It is subjective. That is why an editorial is not considered a seminal document.
Costa Rica has no legitimate military. On the other hand, the
country has a small paramilitary forces. Costa Rica has not suffered a civil
war ever since 1948. Costa Rica preserves a small number of forces capable of
law enforcement, but then again the country has no stable standing armed forces.
