In 3rd grade I had ds memorize the beginning of the Declaration of Independence, the Preamble to the Constitution, first 16 presidents, some state capitals, MCT grammar (parts of speech, subject/object pronouns), some poems, some science definitions and that's about it. I have never had him memorize lists of dates or rulers (other than the presidents). I plan to have him do historical dates when he is older and it will stick a bit better.