If Alfred was ready to move on from the Revolutionary War, it would make things easier for him. But America, like England, wasn't ready to let go of those times—when he (in his past life) allowed his soldiers to aid the British army.
There wouldn't be anything wrong with that, per say, but the problem was that America wouldn't let it go—wouldn't allow them to go beyond holding hands. He said that he would go beyond those small signs of affection if he would apologize about helping England during his Revolutionary War.
Time and time again, Germany couldn't apologize because he doesn't remember that—sometimes, he wonders if America was going crazy, or if he was just plain stupid. He was almost certain that he wasn't alive—didn't exist—as a country during that time.
He knew that there were the German states running around the Holy Roman Empire during that time, and that they were Protestant, which meant that they were more inclined to help England, who was also Protestant at the time. He knew that they were technically not a country at the time, and that his (dead) siblings were in charge of the states during the time.
He couldn't apologize for his siblings' decisions—even if he did, it wouldn't be a true apology. He knew that the problem was stemming from the fact that he was being expected to apologize for "his" mistakes while he had nothing that he was responsible for.
In his mind, America was being too pushy about something that he didn't do—not consciously at the least. He decided that maybe it would be best to try and convince him to let it go—his past, not him. Ludwig hoped this work—the man was becoming more stressful after each passing day.
This day, he finds America looking at his reflection. He didn't realize what America was doing until he saw the tears that silently fell from America's eyes. Ludwig couldn't help but to stare—rarely did America show weakness, even when he thought he was alone (like now.)
Ludwig felt a pang of guilt—for making Alfred feel like that—but he held his resolve firm. He knew what he had to do, and he wasn't going to back down—not when everything they had worked for was at risk. Without any hesitation, he walked up to the blonde—not that he noticed.
America, who was still crying, jumped when he felt (strong) arms wrapped around his waist. It terrified him to think that someone had caught him unaware—that someone was seeing him vulnerable. He silently berated himself for making himself vulnerable—he turned to see someone he thought he could trust.
"Ludwig!" He was obviously pouting—no doubt that he saw the puffy, red eyes that he couldn't hide right now. He couldn't hide from him either, which meant that he had to face the problems. He turned and said, "I need to talk to you."
Ludwig, who also wanted to talk, accepted his invitation. "You need to let go of the past," he whispered as they walked towards America's room.
When all is said and done, they will accept each other and work out the problem. It seems they have a long road ahead of them—for now, they seem to be getting on just fine.