関連ワード:
what was the significance of the westward expansion what was the purpose of the westward expansion what was the significance of the santa fe trail in westward expansion what was the cause of the westward expansion what was the impact of the westward expansion what was the effect of the westward expansion what was the impact of the westward expansion on native americans what was the start of the westward expansion what was the timeline of the westward expansion what was the end of the westward expansion
