Nationalism and Imperialism are two terms that should be understood in different senses. Nationalism is based on aggressiveness in its concept. On the other hand imperialism is constructive in its concept.
Imperialism is a kind of rule that aims at bringing equality of values, beliefs, and expertise among empires and kingdoms through domination and is autocratic in nature and also sometimes monolithic in its concept. Imperialism is a kind of western undertaking that employs expansionistic views and ideas in its ideals. Nationalism on the other hand paves the way for enmity among nations. A nationalist feels that his own country is better than any other country.
According to the great thinker George Orwell, nationalism is deeply rooted in emotions and rivalry. It makes one contemptuous of the virtues possessed by other nations. Nationalism makes one intolerant towards the progress made by other nations.
Nationalism makes one think that the people belonging to one’s own country should be considered one’s equal. Such thoughts are not present the ideals of imperialism. A nationalist does not mind about the deficiencies of his country but on the contrary takes into account only its virtues.
A nationalist strives for the domination of a nation and expresses his love for the country in an aggressive way. An imperialist though creates unequal economic relationship between states yet he maintains the unequal relationships based on domination. This is a subtle difference between the two terms.
Nationalism gives importance to unity of by way of cultural background and linguistic environment. The factors of cultural background and linguistic environment are not taken into account by the imperialist to a great extent.
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The Kansas–Nebraska Act of 1854 was an organic act that created the territories of Kansas and Nebraska. It was drafted by Democratic Senator Stephen A. Douglas, passed by the 33rd United States Congress, and signed into law by President Franklin Pierce. Douglas introduced the bill with the goal of opening up new lands to development and facilitating construction of a transcontinental railroad, but the Kansas–Nebraska Act is most notable for effectively repealing the Missouri Compromise, stoking national tensions over slavery, and contributing to a series of armed conflicts known as "Bleeding Kansas".
The United States had acquired vast amounts of sparsely-settled land in the 1803 Louisiana Purchase, and since the 1840s Douglas had sought to establish a territorial government in a portion of the Louisiana Purchase that was still unorganized. Douglas's efforts were stymied by Senator David Rice Atchison and other Southern leaders who refused to allow the creation of territories that banned slavery; slavery would have been banned because the Missouri Compromise outlawed slavery in territory north of latitude 36°30' north. To win the support of Southerners like Atchison, Pierce and Douglas agreed to back the repeal of the Missouri Compromise, with the status of slavery instead decided on the basis of "popular sovereignty." Under popular sovereignty, the citizens of each territory, rather than Congress, would determine whether or not slavery would be allowed.