Revise the following statement so that it contains correct grammar.
The history of the United Sates are full of remarkable milestones
The history of the United States is full of remarkable milestones.
Complete the following task based on the instruction and optional input provided.### Instruction:
Revise the following statement so that it contains correct grammar.

### Input:
The history of the United Sates are full of remarkable milestones

### Output:
The history of the United States is full of remarkable milestones.