I would avoid Abeka History like the plague.
It was written by someone whose all consuming interest was history and demands detail that virtually nobody can remember but a history buff.
Nor do I care that D.L. Moody’s song leader was Ira Sanky.
Abeka deals with a lot of facts, but my daughter liked Alpha-Omega, I think it was better. She said it explained more WHY things happened than just spewing facts.
For second grade, I’d just introduce them to the basic form of our government and use each holiday as their curriculum guide. Each month has a holiday in it that we celebrate and you can just make the focus of history for that month studying those holidays and what they represent and the people commemorated.
Time is a very abstract concept for kids who are concrete thinkers and them learning to go back that far in time is a real stretch for them, I found.
Also, include geography in that history. Then you’ll have more than enough to cover that subject.