What you're looking at here is footage from the 1924 U.S. Open Cup final - with New England ties. This features the Fall River Marksmen vs. Vesper Buick (St. Louis). It's amazing footage and it could be the oldest American Pro soccer footage in existence.
From the YouTube user, "Soccrmavn":
Perhaps the oldest extant professional U.S. soccer footage--snippets from the 1924 U.S. Open Cup final, played on March 30, 1924. Fall River Marksmen, champions of the American Soccer League, travelled to St. Louis to face Vesper Buick, champions of the St. Louis Soccer League. Before a crowd of 14,000 at High School Field, the Marksmen completed their "double" with a 4-2 win. The match was tied 1:1 at the half, but Fall River prevailed on a brace by Fred Morley and goals from Johnny Reid and Harold Brittan. Harris (whose goal is captured on film) and McCarthy scored for the St. Louis team. Findlay Kerr notched the win in goal for Fall River; Labarge manned the pipes for the losers.