不能向List中添加多个对象，只添加一个对象

我试图将汽车添加到汽车列表中，但似乎只添加了一辆汽车。当执行InventoryCars()方法时，它只显示一个对象。

我做错了什么?

namespace CarLot
{
    class Program
    {
        List<Car> CarList = new List<Car>();
        public static class GlobalVariables
        {
            public static int numberOfCars;
            public static int lotMax = 25;
            public static string userSelection;
        }
        static void Main(string[] args)
        {
            Program p = new Program();
            p.Menu();
        }
        void InventoryCars()
        {
            try
            {
                foreach (var Car in CarList)
                {
                    Console.WriteLine(Car);
                }
            }
            catch
            {
                Console.WriteLine("Something went Wrong!");
            }
            Console.ReadLine();
            Menu();
        }
       void CreateNewPinto(bool isHybrid)
        {
            Pinto myPinto = new Pinto();
            if (isHybrid == true)
            {
                myPinto.hybrid = true;
            }
            else
            {
                myPinto.hybrid = false;
            }
            if (GlobalVariables.numberOfCars < GlobalVariables.lotMax)
            {
                GlobalVariables.numberOfCars++;
                CarList.Add(myPinto);
                Console.WriteLine("Pinto Created! Press any key to continue...");
                Console.ReadLine();
                Menu();
            }
            else
            {
                Console.WriteLine("The lot is full! Press any key to continue...");
                Console.ReadLine();
                Menu();
            }
        }
        static void CreateNewSemiTruck(bool isHybrid)
        {
            if (GlobalVariables.numberOfCars < GlobalVariables.lotMax)
            {
                GlobalVariables.numberOfCars++;
            }
            else
            {
                    Console.WriteLine("The lot is full!");
            }
        }
        static void CreateNewFunnyCar(bool isHybrid)
        {
            if (GlobalVariables.numberOfCars < GlobalVariables.lotMax)
            {
                GlobalVariables.numberOfCars++;
            }
            else
            {
                Console.WriteLine("The lot is full!");
            }
        }
        static void DriveACar(int carNumber)
        {
        }
        static void HonkACar(int carNumber)
        {
        }
        static void FuelUpACar(int carNumber)
        {
        }
        static void DiscountACar(int carNumber)
        {
        }
        void Menu()
        {
            Console.WriteLine("-------------------------------------------------------------------------------");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|                           Lot Master 3000                                   |");
            Console.WriteLine("|                           ---------------                                   |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|      1) Add Pinto                                                           |");
            Console.WriteLine("|      2) Add SemiTruck                                                       |");
            Console.WriteLine("|      3) Add FunnyCar                                                        |");
            Console.WriteLine("|      4) Add Pinto (Hybrid)                                                  |");
            Console.WriteLine("|      5) Add SemiTruck (Hybrid)                                              |");
            Console.WriteLine("|      6) Add FunnyCar (Hybrid)                                               |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|      D) Drive a Car                                                         |");
            Console.WriteLine("|      F) Fuel Up a Car                                                       |");
            Console.WriteLine("|      H) Honk a Car                                                          |");
            Console.WriteLine("|      S) Mark car 'On Sale'                                                  |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|      L) List all Cars on Lot                                                |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("|      0) Exit Program                                                        |");
            Console.WriteLine("|                                                                             |");
            Console.WriteLine("-------------------------------------------------------------------------------");
            Console.Write("Enter Selection: ");
            GlobalVariables.userSelection = Console.ReadLine().ToUpper();
            if (GlobalVariables.userSelection == "0")
            {
                System.Environment.Exit(0);
            }
            else if (GlobalVariables.userSelection == "1")
            {
                Program p = new Program();
                p.CreateNewPinto(false);
            }
            else if (GlobalVariables.userSelection == "2")
            {
                CreateNewSemiTruck(false);
            }
            else if (GlobalVariables.userSelection == "3")
            {
                CreateNewFunnyCar(false);
            }
            else if (GlobalVariables.userSelection == "4")
            {
                Program p = new Program();
                p.CreateNewPinto(true);
            }
            else if (GlobalVariables.userSelection == "5")
            {
                CreateNewSemiTruck(true);
            }
            else if (GlobalVariables.userSelection == "6")
            {
                CreateNewFunnyCar(true);
            }
            else if (GlobalVariables.userSelection == "D")
            {
            }
            else if (GlobalVariables.userSelection == "F")
            {
            }
            else if (GlobalVariables.userSelection == "H")
            {
            }
            else if (GlobalVariables.userSelection == "S")
            {
            }
            else if (GlobalVariables.userSelection == "L")
            {
               InventoryCars();
            }
            else
            {
                Console.WriteLine("Invalid Selection! Enter any key to continue....");
                Console.ReadLine();
                Menu();
            }
        }
    }
}

Program p = new Program();

else if (GlobalVariables.userSelection == "1")
{
    CreateNewPinto(false);
}