After World War I, many nations needed to have tanks, but only a few had the industrial resources to design and build them. During and after World War I, Britain and France were the intellectual leaders in tank design, with other countries generally following and adopting their designs. This early lead would be gradually lost during the course of the 1930s to the Soviet Union who with Germany began to design and build their own tanks. The Treaty of Versailleshad severely limited Germany's industrial output. Therefore, in order to circumvent Germany's treaty restrictions, these industrial firms formed a partnerships with the Soviet Union to legally produce weapons and sell them, and along with other factors built up an infrastructure to produce tanks which later made the famous T-34 and other Soviet tanks.