How long has the government structure of Argentina been in place?

Argentina's current government structure, established by the 1853 Constitution, has undergone several modifications over the years, including significant reforms in 1949 and 1994. While the Constitution has remained the foundational legal framework, it has been amended multiple times to adapt to changing political and social contexts. The basic principles of a federal republic with a presidential system have been maintained since its inception. As such, the core structure has been in place for over 170 years.