The northerners were happy because they got California as a big state which was slave free, as well as slavery being completely outlawed in Washington D.C. Southerners got popular sovereignty rights on the slavery issue as well as the fugitive slave act. This compromise however only put the war away a bit and didn't completely solve the problem.
Answer:
For the America's, disease rapidly killed many native Americans in the masses because they where not yet immune to them. Africa was immune to some European disease because of trade with India. Europe did not suffer as bad from any diseases from America or Africa. I think that's a good answer :)
By threatening other locations.
The common answer you'll get for this question is that the Taliban were a brutal islamic fundamentalists who suppressed their population and who harboured terrorists. And they did (probably the answer that you want). But the United States invasion of Afghanistan in 2003 had some very sinister sides to it- apart from the torture and violations of human rights. Prior to the Taliban's seizure of power, the pro-American government before them had granted Unocal, a US oil company based out of California, permission to pipeline oil from Azerbaijan. Interestingly Unocal donated to both George HW Bush's (1st Bush President) and his son's George W Bush's presidency campaigns and Bush Sr served on the board of the company after his presidency (basically earned lots of money from them) so if youre writing an essay on this topic, I'd recommened you add some of the stuff I said because it highlights a conflict of interest and will probably serve to balance your essay.
Hope I helped and please rate my answer :)