it's an emergency!

Не пользуясь поиском и википедией, попробуйте ответить на следующие вопросы:

1. How many active national emergencies there are right now in the US?

2. How old is the oldest national emergency active today?

3. How recently in the US history we had a period where there wasn't any national emergency?

4. How long the last national non-emergency period lasted?

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