The Swiss have four official languages, so in some ways they are less Homogeneous. They are homogeneous in respect for the rule of law. In the United States, that respect has been under attack for a long time. You cannot expect respect for the rule of law when you preach that the supreme law of the land is flexible and malleable, subject to change at the whim of 5 judges.
That's an interesting point.
About 75% of Swiss citizens speak German, 20% French and 5% Italian - only a handful of villages speak Romansch.
The French and Italian speakers typically study German from preschool through high school.
That being said, about one out of five people living in Switzerland is not a Swiss citizen.