Edit the following sentence to make the grammar correct:

It was a historically significant event
It was a historically significant event
The sentence is already grammatically correct. So no changes needed.
Complete the following task based on the instruction and optional input provided.### Instruction:
Edit the following sentence to make the grammar correct:

It was a historically significant event

### Input:
It was a historically significant event

### Output:
The sentence is already grammatically correct. So no changes needed.