“Pendant" expresses a global duration of an action which might or might not be continued or repeated. "En" in the temporal context stands for a duration of an uninterrupted action or a time limit is somehow implied.
Answer:

Certain believe that it symbolised the blood of Christ, while others suggest that the choice was inspired by the colour of the old Bernese flag. In 1848, it was officially adopted as the national flag and enshrined in the Swiss Constitution.
I answer you in the other question ,and may I get a brailiest for it please
Answer:
Incorrect.
Explanation:
Tu connais si Pierre viens avec nous? not Tu connais si Pierre vient avec nous?
En 1764 se déroule Jeannot et colin