Since, 1978, the United States Federal Government has made home winemaking legal with certain restrictions:
1) A household of two adults or more can make up to 200 gallons of homemade wine annually.
2) Single adult households can make up to 100 gallons of homemade wine annually.
State and local restrictions may apply. This is not intended to be an exhaustive list. You should research your own state and any updates to current legal code.