Armstrong hosts an annual agro-industrial fair, Feriagro, which gathers exhibitors and visitors from the whole country and abroad.

The agro-machinery industry has boomed since the turn of the 21st century, as the Argentine economy recovers.

The area of the present-day town was under the jurisdiction of the Society of Jesus in colonial times.

It passed to Spanish landowners, then to British ones, and then to the Central Argentine Railway company (CAR).

The colony officially became a comuna (a small town commune) in 1886, and a full municipality on 16 November 1984.