Era ends, war looms as U.S. forces quit main base in Afghanistan
AMERICAN troops pulled out of their main military base in Afghanistan yesterday, leaving behind a piece of the World Trade Center they buried 20 years ago in a country that the top U.S. commander has warned may descend into civil war without them. "All American soldiers and members of NATO forces have left the Bagram airbase," said a senior U.S. security official on condition of anonymity. Though a few more troops have yet to withdraw from another base in the capital Kabul, the Bagram pullout brings an effective end to the longest war in American history. The base, an hour's…