Binding a Dropdownlist on a blank form to a Model using a dictionary

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In my Models folder I have a class for United States that looks like this:

 public class UnitedStates
    {
         public static readonly IDictionary Cust_States = new Dictionary<string, object>
                {{"AL", "AL"},{"AK", "AK"},{"AZ", "AZ"},{"AR", "AR"},{"CA", "CA"},{"CO", "CO"},
                {"CT", "CT"},{"DE", "DE"},{"FL", "FL"},{"GA", "GA"},{"HI", "HI"},{"ID", "ID"},
                {"IL", "IL"},{"IN", "IN"},{"IA", "IA"},{"KS", "KS"},{"KY", "KY"},{"LA", "LA"},
                {"ME", "ME"},{"MD", "MD"},{"MA", "MA"},{"MI", "MI"},{"MN", "MN"},{"MS", "MS"},
                {"MO", "MO"},{"MT", "MT"},{"NE", "NE"},{"NV", "NV"},{"NH", "NH"},{"NJ", "NJ"},
                {"NM", "NM"},{"NY", "NY"},{"NC", "NC"},{"ND", "ND"},{"OH", "OH"},{"OK", "OK"},
                {"OR", "OR"},{"PA", "PA"},{"RI", "RI"},{"SC", "SC"},{"SD", "SD"},{"TN", "TN"},
                {"TX", "TX"},{"UT", "UT"},{"VT", "VT"},{"VA ", "VA"},{"WA", "WA"},{"WV", "WV"},
                {"WI", "WI"},{"WY", "WY"}};
    }
Or the longform version:

         public static readonly IDictionary Cust_States = new Dictionary<string, object>
                {{"AL", "ALABAMA"},{"AK", "ALASKA"},{"AZ", "ARIZONA"},{"AR", "ARKANSAS"},{"CA", "CALIFORNIA"},{"CO", "COLORADO"},
                {"CT", "CONNETICUT"},{"DE", "DELAWARE"},{"FL", "FLORIDA"},{"GA", "GEORGIA"},{"HI", "HAWAII"},{"ID", "IDAHO"},
                {"IL", "ILLINOIS"},{"IN", "INDIANA"},{"IA", "IOWA"},{"KS", "KANSAS"},{"KY", "KENTUCKY"},{"LA", "LOUISIANA"},
                {"ME", "MAINE"},{"MD", "MARYLAND"},{"MA", "MASSACHUSETTS"},{"MI", "MICHIGAN"},{"MN", "MAINE"},{"MS", "MISSISSIPPI"},
                {"MO", "MISSOURI"},{"MT", "MONTANA"},{"NE", "NEBRASKA"},{"NV", "NEVADA"},{"NH", "NEW HAMPSHIRE"},{"NJ", "NEW JERSEY"},
                {"NM", "NEW MEXICO"},{"NY", "NEW YORK"},{"NC", "NORTH CAROLINA"},{"ND", "NORTH DAKOTA"},{"OH", "OHIO"},{"OK", "OKLAHOMA"},
                {"OR", "OREGON"},{"PA", "PENNSYLVANIA"},{"RI", "RHODE ISLAND"},{"SC", "SOUTH CAROLINA"},{"SD", "SOUTH DAKOTA"},{"TN", "TENNESSEE"},
                {"TX", "TEXAS"},{"UT", "UTAH"},{"VT", "VERMONT"},{"VA ", "VIRGINIA"},{"WA", "WASHINGTON"},{"WV", "WEST VIRGINIA"},
                {"WI", "WISCONSIN"},{"WY", "WYOMING"}};

In my form for the dropdown I can bind directly to that Dictionary - where Cust_State is the value that my Model will use

     @Html.DropDownList("Cust_State", new SelectList(NCC.Models.UnitedStates.Cust_States, "Key", "Value") )

            

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