The role of the ohio river was very important because it provided resources for the different nations.
Well, the only one that actually makes sense to me is C.
<span>The California Gold Rush of 1849 led asian
immigrants to go to California to find gold mainly from China. During this
time, the gold seekers came to California and infrastructure was built in
California during the Gold Rush. A lot of people became miners.</span>
They were inexpensive and readily available to large numbers of people