Gordon Strachan's team go into the match with confidence running high after beating Croatia 2-0 in October to finish their World Cup qualifying campaign on a positive note.
Scotland last played USA in Florida 18 months ago, when Craig Levein's men were thrashed 5-1, but Adam is confident of a different outcome this time.
"It's a difficult place to go and play and we got beat," Adam said. "We took it on the chin. We looked at the performance and it wasn't good enough and we moved on.
"Our performances have picked up since then. They will be coming to Hampden and it will be a difficult game for them."
Scotland also travel to Norway for a friendly next week, and Adam reckons the matches will help the squad prepare for the European Championship qualifiers.
"It's going to be a good test," Adam added. "The USA have qualified for the World Cup in Brazil and they have a good squad.
"It will be a tough test for us but we are on a good run at the moment ourselves and hopefully with home advantage we can make it count.
"We've made big steps. We beat Croatia home and away and they are a top side. We've done well in the last few games so it would be nice to take it on again.
"It's two tough fixtures this month but we look forward to them because when you are on a good run you enjoy it and you want to play.
"Hopefully we will give a good account of ourselves and try to win the game."