I figured it was a hawk, but have now learned, through a trusted social media site, that it is a juvenile Mississippi Kite.
Whatbird.com has a wonderful forum for bird identification.
The forum is free to join and use. You just have to sign up (username, password, etc.) and then you can post photos of birds you need help identifying, or help those in such need with your expertise.
This post today took much longer than normal for positive IDs to come in, but it was certainly worth the wait!
A few days after taking the above images, I had another opportunity to photograph a young Mississippi kite.
Great Blue Heron, which stood for a long time near the pond that is close to my backyard.