Even though these two verses continue the minimal information that Mormon has been giving, it is important to note that there were no robbers. Not only were they having peace, but they were able to keep out those who would attempt to destroy them. Even more importantly, there were no “Lamanites, nor any manner of -ites; but they were in one, the children of Christ.” That is an important point. The old animosity between Lamanites and Nephites was removed when they all left behind their inherited labels and prejudices and became a new people.
When the “first generation” passed away, we may see that as approximately one hundred years. The Book of Mormon appears to use the term generations for that large number of years, rather than meaning an actual human generational change.