# data[].attributes.custom_properties.aBf1KwIs
countries sought to increase their military powers 

# data[].attributes.custom_properties.aBf1KwIs
heir to Austria-Hungary, his assassination sparked WWI

# data[].attributes.custom_properties.aBf1KwIs
Serbian terrorist that killed the archduke 

# data[].attributes.custom_properties.aBf1KwIs
Germany, austria-hungary, Ottoman Empire 

# data[].attributes.custom_properties.aBf1KwIs
permanent fortifications to protect against attacks 

# data[].attributes.custom_properties.aBf1KwIs
area between trenches that was hard to pass through 

# data[].attributes.custom_properties.aBf1KwIs
new technology that revolutionized warfare 

# data[].attributes.custom_properties.aBf1KwIs
airplanes developed and used for spying, bombing, and fighting in the air

# data[].attributes.custom_properties.aBf1KwIs
ship that sank with American citizens onboard 

# data[].attributes.custom_properties.aBf1KwIs
message from Germany to mexico that was intercepted by Great Britain 

# data[].attributes.custom_properties.aBf1KwIs
belief that a country should stay out of another country's affairs 

# data[].attributes.custom_properties.aBf1KwIs
battleships escorted ships across the Atlantic 

# data[].attributes.custom_properties.aBf1KwIs
epidemic that infected 1/3 of world population 

# data[].attributes.custom_properties.aBf1KwIs
Wilson's plan for lasting peace in Europe 

# data[].attributes.custom_properties.aBf1KwIs
organization designed to resolve conflict 

# data[].attributes.custom_properties.aBf1KwIs
stated that Germany is to blame for the war 