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Napoleon's "Berlin Decree" was a significant policy move aimed at countering Great Britain's economic and financial power. The decree had several key elements:

1. The Continental System: This was the cornerstone of the decree and aimed to exclude British goods from the European market by prohibiting the importation of British goods into any country under French control.
2. Blockade of British ports: The decree authorized the seizure of all British goods found on board ships bound for British ports, regardless of their origin.
3. Reprisals: The decree threatened to confiscate any vessel carrying British goods or even flying the British flag.

As for its effectiveness, the Berlin Decree had mixed results. While it did manage to disrupt British trade and cause some economic hardship, it also had unintended consequences. The blockade of British ports, for example, led to shortages of critical goods in Europe, which hurt French interests as well.

As for alternate methods, let's imagine an alternate setting where the Investiture Crisis didn't occur. In this scenario, Napoleon could have pursued other strategies to counter British power. For example, he could have focused on expanding French influence in South America or Asia, where Britain had established trading posts and colonies. Alternatively, he could have worked to improve relations with the Ottoman Empire, which controlled access to the Black Sea and was a significant trading partner of Britain. By pursuing a more diverse and nuanced approach to foreign policy, Napoleon may have been able to achieve his geopolitical objectives without resorting to such drastic measures as the Berlin Decree.
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