Buenos Aires was one rich town in the late 19th and early 20th centuries* as the combination of migration, agricultural productivity and global prosperity boosted its GNP dramatically. Because so much of that wealth was concentrated in the city, and further concentrated among the oligarchy, it resulted in a lot of architectural display – including monumental art.
They clearly liked showing off men on horses, especially in the middle of parks and roads:
And they start young:
* During the first three decades of the 20th century, Argentina outgrew Canada and Australia in population, total income, and per capita income. By 1913, Argentina was the world’s 10th wealthiest nation per capita.