Wanda Maximoff's journey in WandaVision was a complex one. The character that would become the Scarlet Witch battled grief, started a family and explored her personal history. However, the series' original story would've been even more personal.
In WandaVision, Wanda and Vision are hiding their true identities to fit into American suburbia. Vision is hiding his origins as a synthezoid; Wanda is hiding her powers. While Wanda doesn't necessarily hide her nationality, she does subdue her accent in favour of chasing the American image.
WandaVision was about xenophobia
WandaVision head writer Jac Schaeffer has explained that Wanda's emulation of typical American behaviour isn't unfounded. In the original pitch for the show, Wanda would've battled the xenophobic behaviour of Westview residents – a storyline adapted from the comics.
In an interview with Rolling Stone, Schaeffer explained:
“That idea was in my original pitch, but it was far too literal. In the beginning, we were thinking we would explore the issue of xenophobia, which is very present in some of the older comics. So the mechanism that would propel them into the next episode was a little bit more dramatic, almost cataclysmic. There’s the couple in the comics that make their lives kind of hard; they’re neighbors who like them because he’s a robot, and she’s Sokovian. And so the world would kind of fall apart, and those people would turn a little bit aggressive, and Wanda and Vision would be chased out of town. So the idea of “it’s not going her way, and that’s why she moves forward,” was far more literalized in the beginning. And then it became increasingly subtle and creepier and more based in psychological horror as we moved forward.”