The Argentina Centennial was celebrated on May 25, 1910. It was the 100th anniversary of the May Revolution, when viceroy Baltasar Hidalgo de Cisneros was ousted from office and replaced with the Primera Junta, the first national government.
The year of 1910 was considered quite positive for Argentina, when the last century was seen in retrospective. The country was thriving, the Argentine Civil War had finally ended some decades ago, the state was strong, national limits were marked and institutions like the army, the mailing service, or the educative system were efficient. Population was growing rapidily, due to the massive immigrations from Europe. A growing interest in improving democracy led to the sanction of the Sáenz Peña Law, two years later. The first Argentine copyright law was also enacted by this time, superseeding a patent law that was being used so far for such topics.
The centennial had also an important impact on the historiography of Argentina. Because of the growing numbers of immigrants coming from very different places, it was felt that it was need to clearly define an "Argentine identity". Topics that had once canonic views, such as the wars of independence, started to be seen from multiple perspectives.