The American Revolution (1775–83) and the collapse of the Spanish Empire in Latin America during 1820's ended the first era of European imperialism. Especially in Great Britain these revolutions helped show the deficiencies of mercantilism, the doctrine of economic competition for finite wealth which had supported earlier imperial expansion. In 1846, the Corn Laws were repealed and manufacturers grew, as the regulations enforced by the Corn Laws had slowed their businesses. With the repeal in place, the manufacturers were able to trade more freely. Thus, Britain began to adopt the concept of free trade.