What incident occurred that caused an international uproar and for britain to join the war? austria-hungary's attack on belgium was unacceptable. germany's attack on great britain was shocking. germany's invasion of neutral belgium was not going to be ignored. when turkey joined the central powers, great britain had to join the allied forces.

The correct answer is:

Germany's invasion of neutral Belgium was not going to be ignored.

The German invasion of Belgium (1914) was Germany´s response to the rejection from the Belgian Government to allow crossing through the country to German troops, in accordance with Belgium's historic neutrality. The British Government had promised military support to Belgium in the case of German invasion.

The correct answer is C) Germany's invasion of neutral Belgium was not going to be ignored.

The incident occurred that caused an international uproar and for Britain to join the war was "Germany's invasion of neutral Belgium was not going to be ignored."

The German army had to cross Belgium. But, of course, Belgium being a neutral country in World War 1, did not allow German troops to cross through its territory. Germany chose the easy way, to invade Belgium on August 4, 1914. On August 2, the German government decided to send an ultimatum to the government of Belgium. The German troops had to cross Belgium. Period. Belgium refused with the support of Great Britain and Germany entered Belgium territory initiating the Battle of Liege.

the indians crossed artificial boundaries, setting the stage for conflict

thomas jefferson is the answer