Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Which Rank has a Capacity smaller than 12,000, and a Country of united states?

### Inputs:
table_name: table, columns: ['Rank', 'Stadium', 'Capacity', 'City', 'Country']

### Response:
SELECT SUM Rank FROM table WHERE Capacity < 12,000 AND Country = united states