The southern states at first were comprised of a union who had the same cause to have more power for each state and did not wanted the abolishment of slavery,as it would not benefit the people of south.
So, then there were civil rights movement for the basic rights cause and after that war came which was also to suppress the opposition forces in the Southern states inside the US.
So, there can be a number of examples of the law and order situations which the different nations faced, as there is the ongoing war in Syria. There are some opposition forces who are against the President of Syria Bash-rul-Asad, who they recognize as traitor to there own countrymen and a tyrant, which is not confirmed but its all according to the rebels and other oppositions inside the country. As the foreign forces have now invaded the region and holds a strong power in order to suppress the rebels and other opposition parties inside the region.
This surge in African nationalism was fueled by several catalytic factors besides the oppressive colonial experience itself: missionary churches, World Wars I and II, the ideology of Pan-Africanism, and the League of Nations/United Nations.
"Imperialism is a policy or ideology of extending a country's rule over foreign nations, often by military force or by gaining political and economic control of other areas."
