World War I: Eternal Life, Starting from Selling Arms in Europe

I was reborn and returned to Europe in 1913. I awakened to create a family system. I only need to upgrade the family level to gain eternal life? The world war was about to break out, and Gu Yan decisively started his own journey to make a fortune in the war! AK47, AR-15, G3, FAL, T-34, Tiger, Sherman, P-51 fighter, Iowa battleship... Whoever can buy Gu Yan's equipment can win the war! Technology, medicine, communications, the Internet... Emerging industries that transcend the times were created one by one by Gu Yan in War Cry. Dominate the European continent, influence the United States, manipulate the Asia-Pacific, and help the Xia Kingdom rise... An eternal family that truly controls the world situation is born! Kaiser Wilhelm: Mr. Gu is the most talented person I have ever seen in military and business. Queen of Britain: The Empire on which the Sun Never Sets will always be a friend of the Gu family and the Xia Kingdom! Rothschild: The world is a game, we are the players, and the advisor makes the rules! President of the United States: I once thought that the United States could dominate the world, but unfortunately I met Gu Yan! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.