 
<translate> Nke a bụ ozi dị mkpa: Oge Milwaukee Brewers nke 1998 bụ oge mbụ maka franchise dị ka onye otu National League. N'ihi ya, azịza ya bụ 1998. <eng> This is the relevant information: The Milwaukee Brewers' 1998 season was the first season for the franchise as a member of the National League.
Therefore, the answer is 1998. 