Question

when and why entire nation was in mourning

Answer 1

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━━━━━━━━━━━━━━━━━━━$\mathfrak{\green{Answer.}}$Officials day of National Mourning in Italy on 19 September 2016. Former Israeli President Shimon Peres, died onSeptember 27, 2016. The mourning period was initially 30 days, as per Jewish custom called shloshim, but was extended by Peres' family due to popular demand from mourners.
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Answer 2

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Officials day of National Mourning in Italy on 19 September 2016. Former Israeli President Shimon Peres, died onSeptember 27, 2016. The mourning period was initially 30 days, as per Jewish custom called shloshim, but was extended by Peres' family due to popular demand from mourners.