Americanization
Americanization is one of the most prominent themes in Americanah. In the context of the novel, America itself is a symbol of hope, wealth, social and economic mobility, and, ultimately, disappointment, as Ifemelu learns that the American Dream is a lie and that the advantages she enjoys there often come at a great price. Her Americanization is slow but distinct, and she gradually picks up the slang, adapts to her surroundings (for better or worse), and adopts American politics. Her views on gender and race change because of this, and her blog is devoted to exploring the issue of race as a non-American black in America. She's called Americanah when she returns to Nigeria, having picked up a blunt, American way of speaking and addressing problems. She resists this label, but it's evident to the reader that Ifemelu's years in America have changed her.
According to Idowu Faith, “no valid statement can be made on Americanah without deconstructing the term “Americanah” which, more or less, reveals the thesis of the narrative as well as the preoccupation of Adichie in the text.” In Nigerian parlance, the term “Americanah” is an identity term based on a person's previous experience of living in America. In an interview, Adichie defines Americanah as describing those who have been to the US and return with American affectations, pretend not to understand their mother tongues any longer, and refuse to eat Nigerian food, making constant reference to their life in America.
From this understanding, it is clear that Ifemelu's decision to return home without worrying about being identified as an “Americanah” establishes that Adichie is proposing and charting a path for a new kind of migration story whose quintessence is return migration.
Gender
Adichie's explorations of sexual education and the perception of sex among youngsters in Nigeria plays a fundamental role in the journey of Ifemelu exploring her sexuality as an adolescent in a puritan post-colonial society.
Migration
While many of the migratory experiences in the novel work within migration theory, Adichie simultaneously transcends the borders of international migration theories by introducing a new factor that both influences migration and projects a new perspective on return migration. According to Dustmann and Weiss (2007:237), lack of economic opportunity and escape from natural disaster/persecution are two main reasons individuals migrate throughout history. While identifying the need to flee “choicelessness” as the main reason for much of the migration in the twenty-first century Nigerian setting of the novel, Adichie uses literary dimensions to shake up the foundations of theory. Consequently, the direction of this type of migration, how it affects the bonds of love, how it changes personalities and cultural views, and how it reinterprets identity become the novelist's major theoretical engagements. In addition, Adichie is concerned with how migration debases and elevates, how it barters and fulfills and, most significantly, how it reinvents.
