Another novel we read each year is “Bound for Oregon”. Games and sites have changed over the past couple of years and I have found two activities that are appropriate for our centers. I played the free American Settler iPod app and think that our students would enjoy it. http://itunes.apple.com/us/app/oregon-trail-american-settler/id460062770?mt=8
For the computers, I used the Oregon Trail Thinkquest http://library.thinkquest.org/CR0210182/hardships.html
If you teach “History Alive”, I would continue with the Westward Expansion unit. The students love to fill out the big checks to buy the land with the American presidents’ signatures (and you can review decimals and fractions). It also helps them remember the events because they are on the floor moving across the the United States to participate in the westward movement.