Answer :
On June 15, 1846, the United States and the United Kingdom signed the Treaty of Oregon, completing 28 years of joint occupation of the Pacific Northwest. The 49th parallel was established as the land border by the treaty.
Approximately one in every four American Indians died on the Trail of Tears. A treaty negotiated by settlers and American Indians which gave settlers possession of the area perfectly illustrates how settlers got control of Ohio by 1795. Manifest Destiny ideology inspired a variety of measures aimed at removing or destroying the indigenous population. The leader most affiliated with Manifest Destiny is United States President James K. Polk (1845-1849). Sectional conflicts over slavery were exacerbated by Manifest Destiny, leading to the Civil War.
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