<p>which is easier ?</p>
<p>Depends on what you have learned. World History covers a wide range of history obviously, whereas US History emphasizes pre-Columbian (slightly), colonial and post-18th century history of the United States. If you have or are taking the relevant AP class, then go ahead with that subject, because the SAT tests similar material. For example, after I took AP United States History, I took the SAT US History in addition to the AP test.</p>