The first <a href="https://en.wikipedia.org/wiki/National_League_(baseball)" id="mwQw" rel="mw:WikiLink" title="National League (baseball)">National League</a> baseball game is played at the <a href="https://en.wikipedia.org/wiki/Jefferson_Street_Grounds" id="mwRA" rel="mw:WikiLink" title="Jefferson Street Grounds">Jefferson Street Grounds</a> in Philadelphia.