The First World War 

• The first world war started on July 28,1914. 

The countries involved include-

• Austria-Hungary 
• Belgium 
• Brazil 
• British Empire 
• Bulgaria 
• China 
• France and colonies 
• German Empire 
• Greece 
• Italy 
• Japan 
• Liberia 
• Montenegro 
• Ottoman Empire 
• Portugal 
• Romania 
• Russia  
• Serbia 
• United States  

The US joined the war on April 6, 1917 when Germany became to domineering, causing the United States to become fed up with their actions and wanted to put an end to their threat.