Why did Roman leaders believe farmers/landowners should join the army?

To meet its need for soldiers, Rome hired mercenaries, or foreign soldiers serving for pay, to defend its borders. Many were Germanic warriors who, according to some historians, felt little loyalty to Rome.

Explanation:

the dust bowl, otherwise known as the dirty thirties, was a huge dust storm that killed multiple (and i mean  multiple) farmer's crops, leaving them homeless, and foodless, and jobless. in california, there were 5.7 million residents, and the population shrank as mexicans were repatriated. however, when the dustbowl happened, a lot of people began to move to california. by 1940, 250,000 people had arrived. therefore, your answer would be  the population increased, massively.  i hope this !

explanation: