/// <summary>
        /// Menu for city statistics.
        /// </summary>
        /// <param name="cityStats">A populated statistics object</param>
        static void CityMenu(Statistics cityStats)
        {
            string selection;
            string titleText   = "Cities Menu";
            bool   displayMenu = true;
            string dash        = new string('-', titleText.Length);

            do
            {
                //Display the menu
                if (displayMenu)
                {
                    Console.Clear();
                    Console.WriteLine($"{dash}\n{titleText}\n{dash}\n");
                    Console.WriteLine("Available selections:\n");
                    Console.WriteLine("\t1) Display city's info.");
                    Console.WriteLine("\t2) Display the city with the largest population within a given province.");
                    Console.WriteLine("\t3) Display the city with the smallest population within a given province.");
                    Console.WriteLine("\t4) Compare the population of two cities.");
                    Console.WriteLine("\t5) Display the city on a map.");
                    Console.WriteLine("\t6) Calculate the distance between two cities.");
                    Console.WriteLine("\t7) Update the population of a specific city.");
                    Console.WriteLine("\treturn) Return to the main menu");
                    Console.Write("\nPlease make a selection (ex. 1, return): ");
                }
                displayMenu = true;

                //Handle response
                selection = Console.ReadLine();
                string response;
                switch (selection.ToLower())
                {
                case "1":
                    response = GetValidCityName(cityStats);
                    cityStats.DisplayCityInformation(response);
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "2":
                    Console.WriteLine("\nWhich province do you wish to see the largest population city of?");
                    response = GetValidProvince(cityStats);
                    cityStats.DisplayLargestPopulationCity(response);
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "3":
                    Console.WriteLine("\nWhich province do you wish to see the smallest population city of?");
                    response = GetValidProvince(cityStats);
                    cityStats.DisplaySmallestPopulationCity(response);
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "4":
                    Console.WriteLine("\nWhich city do you want to pick first?");
                    CityInfo city1 = GetCityChoiceObject(cityStats);
                    Console.WriteLine("\nWhich city do you want to compare it to?");
                    CityInfo city2 = GetCityChoiceObject(cityStats);
                    cityStats.CompareCitiesPopulation(city1, city2);
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "5":
                    Console.WriteLine("\nWhich city do you want to see on the map?");
                    CityInfo city = GetCityChoiceObject(cityStats);
                    cityStats.ShowCityOnMap($"{city.GetCityName().ToLower()}|{city.GetProvince().ToLower()}");
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "6":
                    Console.WriteLine("\nWhich city do you want to start at?");
                    CityInfo startingCity = GetCityChoiceObject(cityStats);
                    Console.WriteLine("\nWhich city do you want to calculate the distance to?");
                    CityInfo endingCity = GetCityChoiceObject(cityStats);
                    cityStats.CalculateDistanceBetweenCities(startingCity, endingCity).Wait();
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "7":
                    UpdatePopulation(cityStats);
                    Console.WriteLine("Press any key to continue");
                    Console.ReadKey();
                    break;

                case "return":
                    return;

                default:
                    Console.Write("\nInvalid selection, please enter a valid selection: ");
                    displayMenu = false;
                    break;
                }
            } while (true);
        }