El cohete fue construido por ingenieros europeos en EE. UU. hace 6 meses. Ingenieros: we have to remember that in Spanish the noun goes before the adjectives, so that is why engineers is placed the other way around. Europeos: this word is not capitalized given that in Spanish the name of languages or nationalities are treated as 'nombres comunes'. EE. UU.: abreviations of plural words in Spanish double the letters.