Are you outside with him? Maybe he barks from boredom and has learned he gets to see more of you if he barks.
Training him out of it will go much faster if you go out with him and have him on a long line (very long leash). If he barks, you can correct him easily. Try to catch him when he's thinking about barking but before he actually barks. It's much easier to break the thought of barking than it is to stop him when he's going. The best remedy would be to go outside with him and PLAY with him. Bored dogs bark, dig, cause trouble, try to get out, all sorts of unwanted behaviors. If you're out there playing with him or training him, he'll be too busy to bark and cause trouble. Chance is a young adolescent now and at the stage where he'll cause trouble because he's learning his place in the pack, learning how life works, testing his boundaries, and generally being a preteen/teenage butthead. It's normal in all species. Rather than correcting the behavior, prevent it from starting. Whenever you take your dogs out, especially Chance, be there with them! Play, train, and just be with him. Many people have success with teaching a command to bark, because that then means one can teach a command for NOT barking, giving a valuable "off button" to unwanted noise.
Make sure you SOCIALIZE him constantly. Teach him that other people are great while also getting him used to seeing so many. If he's territorial by nature, that much will still be there but you can reduce some of that suspicion if he's been properly socialized and knows people are generally good. Also, be sure to be a good leader to your dog. If he respects your leadership and has a strong bond with you, you will have the strongest foundation possible in raising a well adjusted, happy dog, and that will reflect positively in all other aspects of the dog's life, including unwanted barking!

Make sure you SOCIALIZE him constantly. Teach him that other people are great while also getting him used to seeing so many. If he's territorial by nature, that much will still be there but you can reduce some of that suspicion if he's been properly socialized and knows people are generally good. Also, be sure to be a good leader to your dog. If he respects your leadership and has a strong bond with you, you will have the strongest foundation possible in raising a well adjusted, happy dog, and that will reflect positively in all other aspects of the dog's life, including unwanted barking!