score:6
Your bags will remain checked, and you won't have to claim them to go through US preclearance at Abu Dhabi. They'll show you a picture of your bags on a monitor and ask you to identify that they belong to you. If they want to look in your bags for any reason, they'll have them brought up to the customs area for inspection. Otherwise, they'll send you on your way to your flight. In either case, you won't need to claim or check them in Abu Dhabi.
When you arrive in Chicago, your flight will essentially be treated like a domestic arrival. Your checked luggage should be transferred automatically to your next flight, and you should confirm that the bag tags applied in Lahore indicate that your bags are checked all the way through to MHK. However, Ethiad uses terminal 5 in Chicago, so you'll likely need to change terminals and go through security again to reach your next flight.
Your bags should appear at the baggage claim when you arrive at MHK (which, for the avoidance of any doubt, is Manhattan, Kansas, not the more famous Manhattan, New York).