America wrote songs for two acoustic guitars and three voices, which is exactly the configuration most beginners end up jamming with friends. The chord shapes are open-position basics. The tempos are forgiving. The arrangements are sparse enough that you can hear what each guitar is doing, which makes them excellent listening tests for your ear.
A Horse with No Name is on this site already and is the lowest-cost entry point in popular music: two chords, looped from start to end, no surprises. Once that loop is comfortable, the next step is Lonely People. Open G, Em, D, and C shapes, slightly more rhythmic activity, and a faster tempo that pushes your strumming hand without overwhelming it.
Sister Golden Hair is the more ambitious target, and it’s worth pointing toward early. With a capo at the fourth fret, the song sits in shapes you already know, but the jangly intro figure rewards repeated practice. This is also where you start hearing how country-rock uses arpeggiation between strums to fill space; the technique transfers to a lot of the folk-pop being recorded today.
The thing worth taking from America’s playing is the discipline of staying in open position. They almost never used barre chords, almost never moved up the neck except via the capo, and almost never strummed with anything heavier than a steady eighth-note pulse. That restraint is what makes the songs sound clean, and it’s a useful corrective if you’ve been chasing complicated chord voicings before getting the basics solid.