During The Great War, Belgium was occupied by Germany. This meant that the Belgian FN plant was unavailable to produce civilian firearms. After the war, FN was able to resume producing Brownings. No A5 shotguns were produced the the Great War. When WWII started, Browning didn't want the same situation, so they went to Remington and asked them to produce a model 11 with the Browning logo stamped on it. Remington accepted the deal since they had been making money from that Browning design for thirty years, but they weren't happy about it.
Browning A5s have been produced for Browning in Belgium and later Japan. The brief relationship with Remington makes the WWII era A5 the only A5 produced in the US. As a result, this particular model is sometimes called the "American Browning."