A really hard AHC: avoid the spread of AIDS, or at least keep it local to Central Africa.
Rules:
1- HIV must exist in the same form and virulence as in OTL (so, no easy answers as "no HIV no AIDS")
2- The supposed timeline for the evolution of HIV and AIDS have to be the same as OTL (late XIX century - first half XX century to the evolution of HIV and second half of XX century to its spread)
Rules:
1- HIV must exist in the same form and virulence as in OTL (so, no easy answers as "no HIV no AIDS")
2- The supposed timeline for the evolution of HIV and AIDS have to be the same as OTL (late XIX century - first half XX century to the evolution of HIV and second half of XX century to its spread)