On April 6, 1917 The US entered WW1, and Amateur Radio was blacked out until Nov 1919.

 

World War I commenced in Europe in August 1914, and the US, under President Woodrow Wilson, was determined to remain neutral. As the fighting and the enemy’s resolve intensified, however, and Germany began sinking ships attempting to evade a naval blockade of England as well as non-military…

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