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The answer is two and a half years.
The United States watched World War I from afar for two and a half years before entering and declaring a war against Germany on April 6, 1917. Before entering the war, United States was intent on keeping a neutral relationship between countries that are involved in the war.
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The United states watched the World War 1 from afar in Europe for a period of two & half years.

What is Foreign policy?

The foreign policy of neutrality prevent the nation from interfering with the external wars.

However, because its needed to helped its allies, its entered and declared a war against Germany on April 6, 1917.

In conclusion, the United states watched the World War 1 from afar in Europe for a period of two & half years.

Read more about policy of neutrality

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