Japanese and Korean comics in American bookstore

I knew that Japanese comics is big in America, but I didn't realize that Korean comics also got their foothold in US market. Maybe it's because the drawing style of Korean comics is almost the same as the Japanese ones. Anyway, here's the whole several book-shelfs of Japanese and Korean comics in a US Bookstore Border. And yeah, it's very astonishing that these comics can fill up three to four bookshelf.