Some Americans thought that making California a part of the US would strengthen the security of the nation because there was going to be fewer war threats by adding more territory.
Explanation
They believed that it would protect them more from war threats because California provided a coastline to protect the country, which added more territory. Having the control of it, they could build a defense against other countries who would want to invade from the west side.
In addition, California's natural resources such as silver, gold, and fertile soil were very important for the nation, which was in a growing process.
Nationalism is a political principle or ideology that aims to unify the whole nation through the value of patriotism, in which each member should value the products produced by its nation, use its distinct language and never accept anything outside their sovereignty. This idea is accompanied by the belief that a certain country is far better than other countries, therefore there's a hidden idea of superiority.
Although pride for one's nation is good; however, this principle led to discontent in the empires of the 19th and early 20th centuries due to the fact that this ideology bred the idea of racism and fascism. These ideas gave a negative impact on humanity.
The Nazi regime (1933-1945) under the dictatorship of Adolf Hitler controlled almost all the aspects of life not just to the Germans but to other races as well. This regime caused the holocaust of the early 20th century where millions of Jews and other people were killed for they were viewed as undesirable. Racism is actually the central feature of Nazi regime where Hitler viewed his country and people as the master of race and the superior of all.
The fascist government run by Benito Mussolini in Italy (1922-1943) is another example of nationalism. Fascism deals more on the economy of the country in which the government controls the private sector's factors of production, it's labor, capital goods, and natural resources. This type of government lured the masses by letting them believe that this control would give them general welfare to achieve their goals. Since the mass of people has been included, the private sector could no longer do anything to fight against the government mandated system.
Both these two systems of governance use the idea of nationalism to override self-interests. They manipulate the mass of people to take control.
The idea of nationalism is naturally good, but the desires of men changed its purpose. It should ideally be applicable to those leaders who value humanity more than himself for this ideology breeds selfishness in the desire for power.
Japan's nationalism over their technologies remains successful until these days because they serve the ideal purpose of nationalism, to love its own country by means of being patriotic.
