Joint rule of Oregon country ended in 1846, but the British continued to help the United States govern. Option A is correct.
<h3>Was the joint rule important in the Oregon Country?</h3>
The United States and the United Kingdom signed the Treaty of Oregon on June 15, 1846, ending 28 years of joint occupation of the Pacific Northwest.
The border between the two countries was founded by the treaty, but the British helped the US govern.
Therefore, option A correct.
Learn more about the Oregon country, refer to:
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A system in which countries kept their sole right to trade with their colonies
New freedmen tended to be poor and less educated.
<span>The Root–Takahira Agreement was an agreement between the
United States and the Empire of Japan negotiated between United States
Secretary of State Elihu Root and Japanese Ambassador to the United States
Takahira Kogorō. The agreement averted a potential war by mutually
acknowledging certain international policies and spheres of influence in the
Pacific</span>
