By the end of middle childhood, the capacity of long-term memory is:

The answer that best completes the statement above is this: VERY LARGE. The capacity of long-term memory is very large by the end of the middle childhood. Basically, during this stage, children are improving their short-term memory and increasing their long-term memory since this is the time that they are performing logical thinking and psychosocial development.

February 1848 is when it was added. if that's what you were asking