roman history AND american history? wild flower question too

So I have been reading through CM’s list of attainments for a child of 6, and I have a question about history. She expresses that a child of six should be able to tell 3 stories from roman history and also 3 stories from english (american in our case) history. Thus far I have just been doing american history with my kids (7.5 and 5). Do I need to teach them some roman history now too, so that my 5 year old can tell me roman history when she is 6? Obviously I’ve already dropped the ball on my 7.5 year old! We are loosely following TQ and finishing AHFYS1 this year, with plans for 2 more years of american history, and not to do world history until my oldest is in 5th. Is that OK?

Another question. We have been studying wildflowers, and doing our best to identify them, but we are struggling with it! We live in GA. Does anyone have a good resource for IDing wildflowers? I feel like there are so many kinds that it’s hard to tell the differences between them!