It's not One Piece or Dragon Ball that has taken over the American market, it's a completely different anime that has the power to cross borders.
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Anime has taken the American market by storm over the past decade, and many series that aren't as popular in Japan enjoy massive fandom among Western audiences. But it's not One Piece or Dragon Ball that currently rules the West; it's Demon Slayer.
Tanjiro's story began with the greatest tragedy imaginable, but he always strived to save his last family member. Along his journey, he discovered dedicated people who also have similar goals. In short, Demon Slayer is everything a Shonen anime needs to be, and the results are in the numbers.
This may be surprising to most, but the US is home to more anime viewers than Japan, largely due to its sheer size and population. Viewership is also huge in Japan, but from a financial perspective, overseas sales have generated a lot of revenue for anime studios.
