Did you not read the thread? Your question was asked and answered. Read and you'll know. Specifically, post #6.
There is a Wide space between the A and M in America. Normally, the A and M are almost touching at their base. However, in 1998, 1999 and 2000 some of the coins were minted with the normal spacing and some with the WAM (wide A M).
I was going thru some nickels an found this! Die slide on the "M" in "UNUM!! Its a 1999-D Upload failed on the obverse!! I'll post it later!Check it out!