Learn Spanish (Latin America): Ustedes también son de Perú.

Yes, ustedes is the plural "you" (like "you all" or "you guys"). In Latin America, it is the only way to talk to more than one person, whether they are close friends or people you are being formal with. English often just uses "you" for both singular and plural, so the English translation doesn't explicitly say "you all."

Why does ustedes use the verb son? Doesn't son mean "they are"?

son is the correct form of ser (to be) for ellos (they) and ellas (they), but it is also the form used for ustedes. In Spanish, the pronoun ustedes always shares its verb conjugations with "they."

Could I put también at the end of the sentence?

Yes! It is perfectly fine to say Ustedes son de Perú también. Placing también (also/too) before the verb, as seen in this sentence, is just a very common and natural word order in Spanish.

Why do we use de right after son?

The word de means "from" or "of." Whenever you want to say where someone is from in Spanish, you use the verb ser (here, son) followed by de and the name of the place.