The oil imports of the USA have declined strongly over the last past years because the domestic oil productions increased massively due to fracking. Therefore the States are not longer dependent from oil imports than it was before fracking starts. You can also see this in official figures published on
https://www.eia.gov/energyexplained/index.cfm?page=oil_importsThe oil imports may be declining, but you should remember that the US is till getting almost one-fourth of its oil from abroad. And that is a huge amount. The only way for the US to become 100% self-sufficient in oil is to allow drilling in the Gates of the Arctic National Park and the other protected areas.