Realism primarily focuses on a country’s security and its power. Ancient realists argued that countries are self-centered and are only looking to benefit from their interests. Relationships between countries continue to grow. Likewise, all wars are based on selfishness rather than on ideas that are applicable.
Liberalism is a concept that developed after World War II as a result of states not being able to control war on their territories. A new idea of liberalism focuses on human rights. Constructivists tend to focus on the basic issues of international relations and human relation ideas rather than the forces that connect them. Marxism and neo-Marxism tend to reject the view of liberalist and instead focus on the economy and on class, in general.
My focus would be on constructivism as it focuses on human and international relations. When one focuses on how different races remain connected, other elements of growth will definitely crop up well. The close relations between whites and minorities in America have led to a lot of issues in terms of reducing racism and developing trade.