Here's why:
* Strong history and culture: The US has a long and vibrant history of comic book publishing and reading.
* Major publishers: The US is home to major comic book publishers like Marvel Comics and DC Comics, which dominate the global market.
* Large consumer base: The US has a large and passionate comic book readership.
* Diverse genres: The US comic book market offers a wide variety of genres, catering to different tastes.
* Strong retail infrastructure: The US has a well-developed comic book retail infrastructure, with numerous comic book stores and online retailers.
While the US likely leads in comic book sales, other countries like Japan, France, and the UK also have significant comic book markets. These countries have their own unique comic book cultures and traditions, and contribute significantly to the global comic book industry.