U. s. africa command, u. s. central command, u. s. european command, u. s. northern command, u. s. pacific command, and u. s. southern command constitute the

Geographic Organized Combatant Commands

Explanation:

Based on the information provided within the question it can be said that all of the Commands listed here are part of the Geographic Organized Combatant Commands. This term refers to unified combatant commands that are organized based on Geographic locations (area of responsibility) around the world.

answer; the confederacy could afford to move a large number of prisoners hundreds of miles but could not afford to fee and house the prisoners;

the telephone is the answer