A History Assignment from the Future

Found in a reverse time capsule dated 1/20/2200: "Our ancestors so much did for us. Things that were expensive and difficult and didn’t even benefit them. They placed hope in the future so that we could have a future. I appreciate everything they did. I wish there were time machines so I could go back and tell them how grateful I am. And to let them know that everything worked out well, that it wasn’t all for nothing. It was all for us."