What were some historical reasons for the invention of pad thai?
The dish was invented in part to help Thailand develop a national identity, and also to promote consumption of noodles to alleviate rice shortages during world war 2.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.
### Instruction: What were some historical reasons for the invention of pad thai?
### Input: 
### Response: The dish was invented in part to help Thailand develop a national identity, and also to promote consumption of noodles to alleviate rice shortages during world war 2.