Answer: It's just a tradition
Explanation: This is just a tradition that President Roosevelt started there really isn't much to it besides it is a tradition. Even Donald Trump nowadays does it and keeps the tradition going. Hope this helps. ;)
Protect the US against threats
The people of the Indus Valley. Some of them were farmers. They grew crops like barley, peas, wheat, dates, and melons. The farms were not just for , some grew cotton and raised sheep, pigs, and cattle. Every town had its own storage building to hold what that town needed.
