Drug

Drug first created is for medical purpose such as heroin is for painkiller but through time people get addicted by it and become unstable.

In the 1839 there is a Drug called Opium the result of it is the Great Britain attack  china for not legalization it. 

Now Drug war still happen but not to legalize it but illigalize it the greatest example is the Mexican american drug war which happen for a long time and agreessive till now.

picture of US mexican border

picture of US Canada border