Learn Spanish (Latin America): Nosotros somos de Perú y ellos son de Argentina. - We are from Peru and they are from Argentina.

In Spanish, there are two main verbs for "to be": ser and estar. We use ser (which gives us somos for "we are" and son for "they are") to talk about permanent traits, including where someone is from. Whenever you state someone's origin, you will use forms of ser.

Do I have to say nosotros and ellos, or can I just say somos de Perú y son de Argentina?

You can often drop subject pronouns in Spanish because the verb forms (somos and son) already tell us who is doing the action. However, when we are contrasting two different groups (like "we" are from here, but "they" are from there), it is very natural to keep nosotros and ellos for clarity and emphasis.

What if the groups are all women? Would the sentence change?

Yes! If an all-female group is speaking, they would use nosotras instead of nosotros. If the people from Argentina are all women, you would use ellas instead of ellos. We use the masculine forms (nosotros and ellos) for all-male groups or any mixed group of men and women.

How does the word de work here?