input: from typing import List
  
  def list_all_countries(filename: str) -> List[str]:
      """ Loads a JSON file containing a list of countries and returns it.
      >>> list_all_countries('data.json')
      ["USA", "Canada", "Mexico", "Brazil", "Argentina"]
      """
output:     import json
      with open(filename, 'r') as file:
          data = json.load(file)
      return data