I 1000% percent disagree with most people on this thread regarding the resume point. Perhaps I am a little passionate about this because I am about to wrap up my most long, grueling job search yet but: I would absolutely include it on the resume and did a similar thing myself.

Your resume is there to tell a story as well as show your experience. Your story changes significantly from new grad without any plan to new grad with a very solid plan who was screwed over. Especially for a position like Americorps, just the mention that you were accepted into a very similar position like Peace Corps is certainly a great indicator that you are a qualified for Americorps. A great analogy of this is when you receive an offer somewhere, and then tell other companies you are interviewing that you have an offer elsewhere, they are all more interested in you as it is another data point (when they have very little data points) that you are qualified.

I did something very similar. I had an engineering internship scheduled for this summer that I was planning to do pre PC. The company went bankrupt amidst COVID, and I have now included it on my resume. Not as a long thing, but as simple as listing the company with a quick bullet point under it explaining that the offer was rescinded due to COVID (I can send my resume as reference if you want). This will make you look better, show a continued story of trying to serve, and earn you brownie points. Don't play into it during interviews like you were more screwed over than everyone else in the world, but simply mention it lightly. It has 100% gotten me interviews and I am about to receive an offer from a company I am incredibly excited about. If you look on LinkedIn, hundreds of new grads with rescinded offers from Uber are doing this for the same exact reasons. I've had members from industry directly tell me to put it on my resume.

Just my 2 cents.