Events on August 4 in history

In response to the German invasion of Belgium, Belgium and the British Empire declare war on Germany. The United States declares its neutrality.

German invasion of Belgium may refer to:

German invasion of Belgium (1914) during World War I

German invasion of Belgium (1940) during World War II

28 Jun

Assassination of Archduke Franz Ferdinand of Austria
Archduke Franz Ferdinand of Austria and his wife Sophie are assassinated in Sarajevo; this is the casus belli of World War I.
26 Jul

Bulgaria
Serbia and Bulgaria interrupt diplomatic relationship.
5 Aug

Traffic light
In Cleveland, Ohio, the first electric traffic light is installed.
15 Aug

Frank Lloyd Wright
A servant of American architect Frank Lloyd Wright murders seven people and sets fire to the living quarters of Wright's Wisconsin home, Taliesin.
1 Sep

Petrograd
St. Petersburg, Russia, changes its name to Petrograd.