Is it possible to contact USA publishers directly? If so, can I find publishers by genre, like I can find literary agents by genre?
Or do publishers have no interest in genre? If so, what's the best way to search for USA publishers online?
If I can find USA publishers online, do they have submission guidelines? If not, do I send them a query letter? If so, do I send the letter to a certain person or to the publishing company? Do I send them a proposal / sample chapter as well?
It may be better to contact a literary agent, but I want to maximize my chance to publish a book.
I've asked a question before about literary agents in the USA, see here How to find the right literary agent in the USA?.