Answer:
geographically to encompass the 12 largest metropolitan and financial areas in the United States.
Explanation:
When the Federal Reserve District Banks were to be divided there were huge discussions on such division but it was later discovered that important places and cities should get their separate divisions.
Accordingly, it was divided into 12 segments which shall cover the most vital economic centres and the most needful shall be served first.
And thus, the metropolitan and financial centres of United States got their area specific divisions.