Nationalism is an intriguing concept to me. It is an ideology with benefits and downsides. I first learned about nationalism in Grade 10 history, when determining the four major causes of the First World War. Since then, I have been curious to learn more. This paper discusses the effect nationalism has on cultural, economic and diplomatic relations between countries. The three case studies in this paper include The United States of America, Hungary, and China. This paper delves deeper into the repercussions of nationalist ideals and what happens when nationalist leaders come into power. There is also the discussion throughout the essay the various forms of nationalism (religious, ethnic, cultural, etc.). Nationalism is an issue because global problems require global solutions. In a time of climate change, immigration crisis, and poverty, the world needs to begin working together, and not retreating within the walls of their borders.