The symbol that most commonly represents a wish in American culture is the wishbone, specifically the wishbone of a chicken. This tradition dates back to the 14th century when it was believed that the wishbone held magical powers. When two people pulled at opposite ends of the wishbone, whichever side broke first was said to grant the wish of the person holding it. The heart is another symbol that is often associated with wishes, representing love, hope, and desire. This association is rooted in the romantic symbolism of the heart as the center of emotions and the seat of love.

The wishbone's popularity as a wish-granting symbol can be attributed to its unique shape, which naturally lends itself to the concept of a wish being split between two parties. The American culture's fascination with the supernatural and the belief in luck also play a significant role. According to a survey conducted by the American Pet Products Association, 61% of American households own a pet, and many of these pets are chickens. This widespread ownership contributes to the wishbone's prevalence as a symbol of wishes.

The heart, on the other hand, has been a symbol of love and desire for centuries. Its association with wishes is rooted in the idea that love and hope are powerful forces that can bring about positive change. This symbolism is supported by various studies on the psychological effects of love and hope. For instance, a study published in the Journal of Positive Psychology found that people who express gratitude and hope are more likely to experience positive emotions and have better mental health.

In conclusion, the wishbone and the heart are two symbols that represent wishes in American culture. The wishbone's popularity is due to its unique shape and the cultural belief in luck, while the heart's symbolism is rooted in the universal human experience of love and hope.