Actually to get your facts straight A-bombs blow up in mid air hundreds of feet above there targets. Hiroshima blew up above a hospital. The concept behind them is to create a mini sun to burn the living shit out of everything. The second it went off something like 5000 people were instantly vaporized, which is fucking ridiculous if you think about it.
On a side note, In 10,000 years if human beings still exist which country will be more popular with historians. Exactly Canada hasn't done shit to be placed within history. your going to be like the Etruscans and the US will be the Romans so suck my dick.