نحن: ضمير مبنى في محل رفع مبتدأ.
رجال: مفعول به لفعل محذوف تقديره أخص.
الوطن: مضاف اليه مجرور وعلامة جره الكسرة الظاهرة.
ثروة: خبر المبتدأ مرفوع وعلامة رفعه الضمة الظاهرة.
المستقبل: مضاف إليه مجرور وعلامة جره الكسرة الظاهرة.
The sentence “نحن رجال الوطن ثروة المستقبل” is analyzed as follows: “نحن” is a pronoun in the nominative case serving as the subject. “رجال” is the accusative object of an omitted verb, meaning “men” with a specific connotation. “الوطن” is in the genitive case, indicated by the visible kasrah, and is a possessive relation. “ثروة” is the predicate of the subject, in the nominative case with a visible dhammah. “المستقبل” is in the genitive case, marked by a visible kasrah, and is a possessive relation. Together, the sentence means “We, the men of the nation, are the wealth of the future.”