How did the alliance system spread the original conflict between austria-hungary and serbia into a general war involving many countries?

The meaning of the alliance system is when countries work together to achieve a common goal. this means that when a country is in need, the other countries help them out. this is why the Austria- hungary and Serbia war resulted into a general war involving many country.

Explanation:

The Hungarian empire declared war  on the slavic country of Serbia following the assassination of a crown prince of the Austrian Hungarian empire by a serbian nationalist. This made the Slavic Russians that had an alliance with serbia to declare a war on the Austrian Hungarian Empire and mobilised their troops to defend serbia their ally.

Futhermore, Germans had alliance with Austria Hungarian Empire also declared a war on Russia. This made France and England to declare war on Germany because they had alliance with Russian. All these led to the general war that involved many countries.

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i hope this

no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others