Final answer:
The Census Bureau collects import and export documents for tracking trade, while the Bureau of Economic Analysis compiles comprehensive trade statistics and conducts various related surveys.
Step-by-step explanation:
The agency responsible for compiling a monthly record of all import and export documents as part of the data for tracking trade is the Census Bureau. However, the Bureau of Economic Analysis (BEA) within the U.S. Department of Commerce uses these records along with various other sources to compile statistics on the balance of trade, including international trade in services, investment flows, and travel information. For example, international trade in services can occur via telecommunications and without the shipping of physical goods, and the BEA captures this through specialized surveys. Furthermore, the BEA is also involved in tracking unilateral transfers such as government aid and charitable foreign donations.