This was caused by the bubonic plague also known as the 'black death'.Disease from flies that were on rats cause the population to wipe out.
June 21st is the solstice for summer so the season is winter in the southern hemisphere.
Fallout shelters are still someone in use but not for the purposes of nuclear fallout, only severe storms, etc. Th Interstate Highway System is the best choice from this list.
They faced different expectations. Sons were expected to be strong, while daughters were expected to be intellectuals.
Atomic bombings of Hiroshima and Nagasaki