Scotland captain Gordon Bulloch saluted a job well done after his side secured their second bonus-point victory against the USA.
Scotland scored five tries
The Scots were made to work hard against a physical Eagles side but after a sticky third quarter eventually ran out 39-15 winners.
"It was very hard work, but we are very pleased with that," Bulloch said.
"The Americans were tough tacklers and we are just pleased to get five points.
"Ten points from the first two games against tough opponents was what we wanted and we are happy to get to the France game intact."
Bulloch admitted the Scots will need to improve their discipline when they face group favoruites France in the probable pool decider on Saturday.
"You have got to play the referee and we kept getting penalised too often and you can't do that," he added.
"We have got to clean up our act on discipline before Saturday.
"But everyone has had a game now and we are looking forward to getting down to Sydney and facing France."
The match left coach Ian McGeechan with some selection dilemmas for the crucial French fixture.
Wing Simon Danielli marked his first World Cup start with two tries after scoring within 30 seconds of appearing as a replacement against Japan, while Gregor Townsend also capped a solid display at fly-half with a try.
"It is always nice to score tries," said Danielli. "The first one took a bit of work but I was delighted to get over the line.
"I thought I was going to run out of juice but fortunately the guy fell off the tackle and I just made it.
"The Americans are a tough side and very physical, so we knew we were in for a battle
"A few errors crept in towards the end but it is a step forward, which is good."
McGeechan was pleased to see his side avoid conceding any tries and applauded the defence during the ten minutes Tom Smith spent in the sin-bin.
"It was a bit of a mixed performance," said McGeechan.
"The first-half was excellent as we got got a lot of control and we knew the USA would be fired up for the first 40 minutes.
"The second half was more difficult because we started with 14 men and that disrupted our rhythm.
"However, I think our defence was excellent and the players can be commended for that and we barely suffered any damage in that period."