How do I find an historial biography book that is about someone after 1864? I don't care who it's about.
Click on the WorldCat link below and do a subject search on biography by typing su:biography.
You are going to get thousands of results this way if you don't include something else to search for, such as presidents, indians, etc.
To limit your results, you can browse for a few pages. If something looks interesting, click on the title link. Look at the subjects on the left. Click on a subject that looks interesting, and this will conduct a more targeted search for you.
You can also use the limiters on the left if you have a preference for print books or eBooks. Just put a check in the appropriate box.