Do you think an entire nation can hide a secret?

We know that governments hide secrets from the people all the time, and education systems can hide or omit history from a culture. But I mean as a nation entirely. Do you think the people of a nation/culture collectively can hide secrets from the rest of the world about something in their history or culture?

Do you think an entire nation can hide a secret?
Do you think an entire nation can hide a secret?
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