soy de... means: I am from... literally: "I am of..."
Dominicana de Aviación was created in 1944.
Dominicana de Aviación ended in 1999.
"Soy de México" means "I am from Mexico".
Santo Domingo es la capital de la República Dominicana.
Bolsa de Valores de la República Dominicana was created in 1991.
"Soy de España" means "I am from Spain" in Spanish.
Yo soy de Portugal means 'I am from Portugal.'
i am from...
If by America you mean USA Soy de Estados unidos if you mean the continent soy de America
I am from Venezuela
No soy de Milano would translate into something along the lines of "I am not from Milano".