KABUL, Afghanistan — Even as more American troops flow into the country, Afghanistan is more dangerous than it has ever been during this war, with security deteriorating in recent months, according to international organizations and humanitarian groups. Large parts of the country that were once completely safe, like most of the northern provinces, now have a substantial Taliban presence — even in areas where there are few Pashtuns, who previously were the Taliban’s only supporters. As NATO forces poured in and shifted to the south to battle the Taliban in their stronghold, the Taliban responded with a surge of their own, greatly increasing their activities in the north and parts of the east. The worsening security comes as the Obama administration is under increasing pressure to show results to maintain public support for the war, and raises serious concerns about whether the country can hold legitimate nationwide elections for Parliament next Saturday. Unarmed government employe...