it's not just the US that is behind in having the minerals necessary: it's the entire world! In order to electrify every car in the world, it would take half the world's known supply of lithium.
"known reserves" not "known supply". Lithium is a very common element on Earth, so the known supply is many orders of magnitude more than we need. "Known reserves" is defined as those that are currently economically viable to extract. Which is why the amount of known reserves can grow drastically when the price increases slightly or extraction methods get cheaper.