South African Traveling throught US..Is transit Visa needed?

[immihelp]

I am a South African with work permit and visa to work in Canada.I am currently planning to visit South Africa in a weeks time from Canada, do i need a transit visa to pass through US?If so how long does it take to get it?

[immihelp]

Yes.

http://www.immihelp.com/visas/transitvisa/