Manufacturing activity in the District of Columbia, Maryland, North Carolina, South Carolina, Virginia, and most of West Virginia fell deeper into negative territory as shipments and new orders fell, according to the most recent survey from the Federal Reserve Bank of Richmond.The composite manufacturing index was at -11 in December, down from -5 in November, the Richmond Fed said Wednesday. Shipments fell to -17 from -8, new orders decreased to -14 from -5, and employment declined to -1 from 0.