The primary user of Meth first tries it is a young white male, between 14 and 19-years-old.
The primary user of Crack first tries it is a young black male, between 14 and 19-years-old.
While Crack has a stronger "high" and stronger addictive qualities, adding to its quick spread in city communities, let's just assume they're close enough.
The biggest difference is policing and sentencing.
5-grams of Crack gets you mandatory 5-years minimum sentence.
90-grams of Meth, I recently read here, gets you 5-months.
Imagine if it were also 5-years?
Imagine if all those young white males, from 2000 to 2012 that were caught with a few grams of meth, let along a friggin' lab, were still in prison or just possibly getting out?
Try and imagine the disastrous effect it would have on their communities and "white culture" as a whole?
Imagine if, instead of social campaigns to stop Meth use the government used policing campaigns - thus increasing the incarceration rate?
I think, and hope, you might recognize it would be horrendous. Perhaps you might understand how and why Crack cocaine and the sentencing of it's possession, would have such a huge impact on "Black America" still today.
Slavery (destruction of culture, language, history) -> Jim Crow (destruction of economic development, disenfranchisement of voting rights) -> Crack (destruction of community)
Slavery was from Birth of the Nation until 1865, Jim Crow was 1865 until 1965, Cocaine and Crack from 1970 until 2000 (when use dissipated).
These are not discrete effects upon Black American society, but cumulative.
If Meth were as bad as Crack, "White America" may not have the first two as strong a drag upon them, but it'd be suffering mightily under the weight of Meth...