For the same reason the USA has problems as a result of Pearl Harbour and 9/11 and the UK has problems as a result of the flattening of London and Coventry, and Germany has problems as a result of the fire storm in Hamburg. Man sometimes has an unhelpfully long memory and holds grudges for a similarly long time.
It seems that the health issues are down to the minimum.
Every country has problems.
The blast over Hiroshima and Nagasaki doesn't affect the people today.
All countries have political problems.
Problems experienced by people in other countries.
china,america,indonesia, low sea level countries
American B-29 bombings, fire bombings, two atomic bombings, and about two million war casualties. Japan's suffering was not the worst of any WW2 country, but it was substantial.
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The problems faced by the less developed countries are mainly corruption in the government and total lack of job opportunities.
problems hindering the transfer of technology
they cause technology problems
financial problems