The Swedish American Line was founded in 1915, at the time under the name Rederi AB Sverige-Nordamerika. That same year, they acquired their first ship, the Dutch steamer Potsdam, which made her first voyage between Gothenburg and New York for the newly founded shipping line on December 11, 1915. By then she had been renamed Stockholm.
By the time the ocean liner service was suspended in 1940 because of the Second World War, more than 500,000 passengers had sailed with the company across the Atlantic. In 1957, the one millionth passenger made the trip although this was followed soon after by a downturn as air travel rapidly took over transatlantic passenger traffic.
The company struggled on for a few more years before finally discontinuing the service in autumn 1975 and selling off the remaining vessels in the fleet.