How come most country singers sound alike? this is a serious question..?

I have been living in the U.S for almost 10 years now.. I been listening to hip hop for the last several years..After a while, I find that most people I met who listen to hip hop are not wise or unprofessional. Also, many songs in hip hop contain inappropriate lyrics. I decide to change things a little and be more American by listening to country music, lol... after searching for top country songs, I found that many singers sound alike.. I think I should stick with my native music.