Cattle were first brought to Argentina in 1536 by Spanish "conquistadors". Due to the geography of the Pampas and a small national market, the cattle multiplied rapidly. Railway building within Argentina and the invention of refrigerated trains and ships in the late 19th century made an export market and Argentina's beef export industry started to thrive. The flipped seasons between the Northern and Southern Hemispheres meant that Argentine beef came onto the market at a time of year when beef was less at hand in the Northern Hemisphere, which further lifted the potential export market in the United States and European markets.