The rising importance of Hello Kitty in the United States in the last decade reflects the craze over the children’s brand in Asia since the 1970s. Hello Kitty fits into the 21st century American love affair with anime and simple art.
(Translation is identical as the text is already in English, but if you'd like a rephrased version or further explanation, let me know!)
Alternatively, for slight rewording:
Over the past decade, the growing significance of Hello Kitty in the United States mirrors the frenzy surrounding the children's brand in Asia since the 1970s. Hello Kitty aligns with Americans' 21st-century affinity for anime and minimalist art.