input: from typing import List
  
  def extract_country_names(countries: List[dict]) -> List[str]:
      """Extracts and returns a list of country names from a list of country dictionaries.
      Each country dictionary should have a 'name' field.
      >>> extract_country_names([{"name": "United States"}, {"name": "Canada"}])
      ['United States', 'Canada']
      >>> extract_country_names([{"name": "Brazil"}, {"name": "Argentina"}, {"name": "Chile"}])
      ['Brazil', 'Argentina', 'Chile']
      """
output:     return [country['name'] for country in countries]