World War One was the war to end all wars, but in reality, it was only the beginning. WWI saw America move from an isolated power to a world power, placing it as a leader in international politics. It saw the US military rapidly expand from a second-rate force to a world-class fighting force. It would become a defining moment for the United States, its military, and its citizens. Explore American involvement in the war, learn from where America came and where it would go.