In 1908, the United States of America became the first country outside France to host an automobile race using the name Grand Prix (or Grand Prize), run at Savannah. The first Grande Épreuve outside France was the 1921 Italian Grand Prix held at Montichiari. This was quickly followed by Belgium and Spain (in 1924), and later spread to other countries including Britain (1926). Strictly speaking, this still wasn’t a formal championship, but a loose collection of races run to various rules. (A “formula” of rules had appeared just before World War I, finally based on engine size as well as weight, but it was not universally adopted.)
In 1904, many national motor clubs banded together to form the Association Internationale des Automobile Clubs Reconnus (AIACR). In 1922 the Commission Sportive Internationale (CSI) was empowered on behalf of AIACR to regulate Grand Prix racing and other forms of international racing. Since the inception of Grand Prix racing, competitions had been run in accordance with a strict formula based on engine size and vehicle weight. These regulations were virtually abandoned in 1928 with an era known as Formula Libre when race organisers decided to run their events with almost no limitations. From 1927 to 1934, the number of races considered to have Grand Prix status exploded, jumping from five events in 1927, to nine events in 1929, to eighteen in 1934 (the peak year before World War II).