“When we speak of nationalism, or culture, there is in reality only one nation or one culture: the nation of God and the gospel culture, a vast amalgam of all the positive aspects of our cultures, histories, customs, and languages.
…As an example of what the gospel of Jesus Christ can do, we had the moving experience of seeing members from nations that fought against each other some thirty years ago gathered in area conferences in Munich, in Korea, and in other places. All of them were united under the same banner of the gospel.
In conclusion, I would say: keep your national heritage in your heart, be proud of it, cultivate these values in your families as long as they are building the kingdom of our Father in heaven. As soon as it comes out of these boundaries, it is used more to create differences among people than to bring them together. We are one nation; we have one eternal Father; we are brothers and sisters—different, but with the same eternal goal of helping to bring to pass the immortality and eternal life of man.
The final word is given by our Lord as a commandment, not only as an objective: “I say unto you, be one; and if ye are not one ye are not mine.” (D&C 38:27.)”