(CNN) In his first week as President, Donald Trump is taking executive actions at a rapid clip, scrawling his sawtooth autograph on documents he hopes will stake out a sharply conservative agenda over the next four years and beyond.

Shaping his administration's policy through orders and memoranda on everything from health care to oil pipelines to immigration, Trump is collecting evidence of campaign promises fulfilled.

But if he hopes to see his vows realized fully, the unilateral moves this week won't suffice; he'll need cooperation from Congress and buy-in from Republicans and Democrats alike to push forward with ideas he claims will reshape the American economy for the better.

Like presidents before him, Trump has issued a flurry of actions as an opening salvo to his government, denouncing on paper some of President Barack Obama's chief accomplishments: his signature health care law, his massive Pacific trade deal, and his decision to scuttle the Keystone XL oil pipeline.

Also like his predecessors, Trump will find his powers to enact major changes are limited. His executive moves alone can't roll back the Obama legacy. And just as his predecessor faced legal challenges to his executive power, Trump will likely confront resistance to his moves in court.

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