The Reds arrived in the United States late last week to continue their pre-season preparations and they opened the scoring against Dortmund after Virgil van Dijk powered home a first half header.
There was a blow for Liverpool midway through the first half when Joel Matip - who has only recently returned from injury - limped off with what looked like a thigh problem, being replaced at the heart of the defence by Joe Gomez.
Loris Karius (played entire match) - 5: nearly a "Karius calamity" in just the third minute when he played the ball straight out to a Dortmund striker, toughest save he had to make in the first half was from a van Dijk back pass, held one sharp low cross late in first half - though it nearly bobbled out, could not be blamed for the penalty miss or Pulisic's second but palmed Pulisic's shot straight to Bruun Larsen for the third.
It was Liverpool's other starting centre-back who broke the deadlock. With the ball he has the same speed as without, you don't have a lot of players with this quality.
Daniel Sturridge was in action for Liverpool against Borussia Dortmund on Sunday.
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Clear cut chances were few and far between in the opening 15 minutes, despite both sides playing at a good tempo early on. He made little impression, however.
Pulisic dusted himself off to take the spot kick and made no mistake from 12 yards, with the American-born attacker putting his effort straight down the middle.
He stated: 'This attack on Loris Karius will ever end?
The 25-year-old endured the worst moment of his professional career in May's Champions League final against Real Madrid, gifting Karim Benzema and Gareth Bale goals with two catastrophic errors.
A mistake from Loris Karius led to Jacob Larsen poking home a third in stoppage time to give Dortmund a 3-1 win at the Bank of America stadium.