Question
What is the process to modify the inserting of new address records for an account? When the [+] icon is pressed, the address type needs to default to “Billing & Shipping” and the [Country] to the “United States”.
Answer
Once you click [+], you will still need to select the address type. But you can set up a default value for the [Country] field by creating a replacement object for the [Base address] parent object. In the newly created object you need to select the default value for any field you want:
Save the object and try to add an address. You will notice the fields being populated by the default value.