In 1914, Europe erupted in a war unlike any the world had even known. Grueling trench warfare and the introduction of modern weaponry such as machine guns, tanks and chemical weapons led to unprecedented levels of carnage and destruction throughout the entire continent. The Great War - as it was then known - lasted for four years with the Central Powers of Germany, Austria-Hungary and the Ottoman Empire fighting the Allied Powers of Great Britain, France, Russia, Italy, Japan, and the United States. World War I marked a turning point for America when the isolationist nation half a world awayinvolved itself in world affairs and began its ascent to the most powerful nation in the world. The war cost more than 9 million lives - 100,000 of which were American - and destroyed most of Europe.The Allied victory in 1918 was cause for massive celebrations all over the world, but the peace would last only 20 short years before conflict would once again engulf Europe. Now you can own thisset of genuine U.S. silver coins that has been specially assembled to mark the centennial of World War I. This magnificent set contains: one 1921 Morgan Dollar, one 1921-P Peace Dollar, one 1918 Walking Liberty Half Dollar, and one 1918 Standing Liberty Quarter Dollar! These classic American coins come in our NumiShield Archival Case and are presented in a beautiful wooden collector box, customcrafted to preserve and display your precious treasures for generations to come. 1918 Standing Liberty Quarter Dollar • Minted in .90 pure silver • 24.3 mm in diameter (.97") 1918 Walking Liberty Half Dollar • Minted in .90 pure silver • 30.6 mm in diameter (1.2") 1921 Morgan Dollar • Minted in .90 pure silver • 38.1 mm in diameter (1.5") 1921-P Peace Dollar • Minted in .90 pure silver • 38.1 mm in diameter (1.5")