Final answer:
Uruguay is the present-day name of the former Bandera Oriental and Cisplatine Province after gaining independence and establishing itself as a sovereign nation.
Step-by-step explanation:
The country formerly known as the Bandera Oriental and the Cisplatine Province is today known as Uruguay. Bandera Oriental refers to the period when Uruguay was part of the Spanish territories in South America, while the term Cisplatine Province was used when it was under Portuguese and later Brazilian control.
Eventually, after a series of battles and political efforts, including the contributions of national hero José Gervasio Artigas, Uruguay gained its independence and established itself as an autonomous nation.