So, salmonswimupstreamto get totheir spawning grounds, and lancet flukes commandeer a passing ant, crawlinto its brain, and driveit up a blade ofgrass like an all-terrain vehicle.
In theory, when someone unearths anything over 300 years old, he is supposed to contact the Directorate-General of Antiquities, which has three months to examine the object or site before deciding whether to commandeerit.
So while Congress can't commandeer the states to do its bidding, it can offer them more or less any bargain it likes and states have the choice to voluntarily accept the terms or not.