Passage: Gordon B. Hinckley saw a trend in national politics by which city-states and nation-states have unified and suggests that the international arena will eventually follow suit. Many countries such as China, Italy, the United States, Australia, Germany, India and Britain have unified into single nation-states with others like the European Union following suit, suggesting that further globalization will bring about a world state.

Question: What have all these countries formed?
single nation-states