How can a government build a unified nation out of a people with diverse interests and concerns?

How many countries colonize eritrea? Why did Henry IV favor lay investiture? What do you do for the government and government does for you? How much does the mayor make a year? Is communism bad? What is the ethnic heritage of the british monarchy? How well was America as a multi-ethnic society between 1918 and 1929? How are people treated in communism? Who is the president of Grenada? What kind of monopoly often provides basic necessities such as public utilities? What were the goals of the Bolsheviks? Who was the Governor of New York in 1944? What does the phrase middle of the road in politics mean? The makeup of the state legislature of Kansas? Why did the English king and parliament quarrel in the 1640's? How are the European absolutist governments different? How long is on term for a mayor? Why do you need a local council? Why is a republic considered an indirect form of government? The new two party political system that emerged in the 1830s and 1840s?

How can a government build a unified nation out of a people with diverse interests and concerns?