Nationalism was once a modern force for social unity and independence, but once it is successful, it can easily become a force of conservative oppression. Few political leaders have the insight to place the needs of their people above the national goal. And often the means to modernize become ends in themselves. What is the incorrect understanding of this text? ['Nationalism is a double-edged sword.', 'Nationalism has the essential attributes of conservativeness and oppression.', 'Visionary politician puts the needs of the country first.', 'Nationalism has played an active role in the establishment of the modern state.']