Pulisic struck for the comfortable victory at Elland Road last night.
"I thought we started really well, we came out with a lot of intensity and got a goal and then obviously the red card made it a bit easier. All around it was a good performance, but we still have some important games coming to focus on," Pulisic said.
"We knew how they like to play as a team and we knew it was important - especially coming here with the atmosphere and everything - to start well and come out, and we showed that."
A win puts the Blues eight points clear of fifth place Spurs with two games to go, both of which are at home in the final week of the season, and the American believes a top-four spot is now there's to lose – despite Spurs having a game in hand.
"We dropped a couple of points and we were not happy at all, but we always try and stay positive and look forward to our next game,' he added. 'Today puts us in a really good spot, we can control our own destiny, so now we need to continue and go on to get result after result.
"Of course, we wanted to finish with as many as we can, we definitely could have been slightly more clinical. A 3-0 win away, we are happy and we're happy with the performance all around."
On Romelu Lukaku scoring again, Pulisic added: "It is what Rom does, he scores goals,' said Christian. 'He's a great player and it is good to see him in form now."
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