In 1980, a Diplomatic Conference of sixty-two states unanimously approved the United Nations Convention on Contracts for International Sale of Goods. This action concluded almost fifty years of effor to unify the law for the international sale of goods and, in the process, superseded the frequently criticized 1964 Hague Convention on the Uniform Law for the International Sale of Goods (ULIS) and the Uniform Law on the Formation of Contracts for the International Sale of Goods (ULF). Since that time, 21 states, including the United States, have signed the 1980 Convention and 2 states have ratified it.