The practical conclusion which List drew for Germany was that it needed for its economic progress an extended and conveniently bounded territory reaching to the seacoast both on north and south, and a vigorous expansion of manufacture and trade, and that the way to the latter lay through judicious protective legislation with a customs union comprising all German lands, and a German marine with a Navigation Act. The national German spirit, striving after independence and power through union, and the national industry, awaking from its lethargy and eager to recover lost ground, were favorable to the success of List's book, and it produced a great sensation. He ably represented the tendencies and demands of his time in his own country; his work had the effect of fixing the attention, not merely of the speculative and official classes, but of practical men generally, on questions of political economy; and his ideas were undoubtedly the economic foundation of modern Germany as applied by the practical genius of Bismarck.