The Americans completely dominated their Caribbean opponents, whose starting lineup included five players 15 years old or younger - the youngest being 12-year-old midfielder Tate Cuffy.
The match marked the first time a Bahamian team at any level had played in the finals of a CONCACAF championship.
The United States, which two years ago outscored its opponents 38-0 but lost to Canada on penalties in the semifinals and failed to qualify for the World Cup, controlled throughout, hitting the post or crossbar three times in addition to its goals.
It took only 38 seconds for the Americans to grab the lead. Gabby Miranda sent a cross-field pass from the left to Margaret Purce, who ran in from the right flank, past left back Linsday Seymour and beat goalkeeper Cori Strachan from near the penalty spot.
Green doubled the lead five minutes later by capitalizing on a loose ball in the area. Strachan let Lauren Kasie's corner kick slip through her hands. Emily Bruder had one chance that was blocked on the line by defender Kennadi Green, but Summer Green pounced on the clearance, sending a left-footed drive high from nine meters.
The Bahamas, who was captained by Lauren Haven - one of Bahamas Football Association General Secretary Lionel Haven's two daughters on the team, didn't get a shot on goal until the 68th, but managed to keep the Americans at bay until late in the half.
Strachan came up with several blocks and saves to thwart Bruder and Purce, as the Americans also shot wide and high, but Green scored three times in the final six minutes of the half to turn the game into a rout.
Andi Sullivan added a goal of her own in the 55th - a shot from about 25 meters that Strachan got both hands to but let it pop over her into the net -- to hike the lead to 6-0, and Green finished her day in the 60th.
Purce added two more in the 75th and 83rd and Toni Payne tacked on another in the 77th.
Bahamas lone shot came in the 68th when Kennadi Green was able to sprint down the left and get off an effort from inside the area that U.S. keeper Jane Campbell went to her knees to grab.
The result matched the second-most lopsided result in the history of the CONCACAF U-17 women's finals, equaling a 10-0 win by the United States over Costa Rica in 2010, but short of its 13-0 rout of the Cayman Islands two years ago.