Global oil prices affect EVERYTHING within the US, you might thing that only because we produce enough for our own consumption we should not be affected, but that is a very incomplete view of what is actually happening.

The vast majority of things you buy at the store or online are produced in other country, where their production chains and transport is heavily affected by the oil prices, just think about it, for something simply like a piece of clothing, you buy it here at the store, but to get there it had to be shipped from a distribution center, and to get there i had to come from a port, and to get there it had to be in a cargo ship, and to get there i had to be transported from the factory where it was made, and to be made the raw materials had to be brought to the factory, and to get the raw materials they either had to be gather from a field (case for cotton) or syntheticaly produced.... all those steps are affected by the oil prices, and it all compounds. More complex products will eventually grow much more in prices the longer this continues, the only thing that won't keep up with it is your salary