One important (a) group that moved to California during the Gold Rush was the Chinese.
John O'Sullivan said that the United states had a (b) to spread across the continent of North America.
The (c) resulted in a major gain of territory for the United States in 1848.
President Thomas Jefferson sent Lewis and Clark to explore the land gained from the (d)
The (e) spelled out how the areas of the Northwest Territory (Ohio) could become states. Westw