It has nothing to do with race and everything to do with CLASS. The war on drugs unfairly targets the POOR.  The fact that racial minorities in both the USA (Latinos and African Americans) and in Canada (First Nations) are dis proportionally affected by these policies is because they make up a larger percentage of the "poor" demographic than they do the general population. The result is that their racial group is being more affected by policies that unfairly target the poor.

Now this doesn't account for sentencing, plea bargains, etc where there is definitely systemic racism involved.

Address the issue of poverty and why racial minorities are disproportionately represented in the poor demographic and you will solve many other "race" issues in the process