I believe an answer could be assimilation, as assimilation is the integration or process of people/ideas/culture into a bigger culture or society. It was one of the major results of immigration into the United States.
I hope this helps :)
Answer:
Hope this answer will help you
<span>-They help to prevent bank runs by reassuring the public that banks will not make too many loans and run out of cash.
-They help to facilitate transfers of funds between banks when a customer from one bank writes a check to a customer of another.
-They help to control the money supply.
Hope I helped </span>