Categorize the text into one of the following topics: sports, food, politics.
The United States is a two party system with a Republican and a Democratic party.
The topic of the given text is politics.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the text into one of the following topics: sports, food, politics.

### Input:
The United States is a two party system with a Republican and a Democratic party.

### Output:
The topic of the given text is politics.