Im about to order S2, does that include the DragStrip?

Both the S1 license and the S2 license include the Dragstrip.
Welcome and have fun in S2.

Now, what is all included in S2? If i just buy S2?

all the tracks you can see in the track selection menu, all the cars you can see in the car selection menu. there is no single-player mode, LFS is an _online_ racing simulator.

There actually is a Singplayer Mode but it's by far not as interesting as the Multiplayer Mode.

I think what people are trying to say is that you get all of the S1 content with the S2 license. S2 is EVERYTHING.

Quote from Dajmin :

I think what people are trying to say is that you get all of the S1 content with the S2 license. S2 is EVERYTHING.

sweet!!! thx alot guys

how do i buy it in USD's?

The same way you buy it in any other currency

https://www.liveforspeed.net/?page=shop - this page (once you've logged in) gives you a bunch of options to choose from. You can try to use your regular credit card in the standard way, but if that doesn't work you can give the PayPal method a shot - you don't even need a PayPal account to use it.
If you don't have a credit card, you can set up a transfer direct from your bank account using the Moneybookers option.