The dispute over the Oregon boundary was between: the United States and England
the United States and Russia
California and Russia

Explanation:The Oregon Treaty settled the dispute between the United States and Great Britain over the area in Oregon located between the Columbia River and the 49th parallel. In 1818, both countries had agreed to a joint occupation of Oregon, and this agreement had been renewed by treaty in 1827

d) a constitutional amendment

when world war i broke out across europe in 1914, president woodrow wilson proclaimed the united states would remain neutral, and many americans supported this policy of nonintervention. however, public opinion about neutrality started to change after the sinking of the british ocean liner lusitania by a german u-boat in 1915; almost 2,000 people perished, including 128 americans. along with news of the zimmerman telegram threatening an alliance between germany and mexico, wilson asked congress for a declaration of war against germany. the u.s. officially entered the conflict on april 6, 1917.