In many ways, Lincoln's famous Emancipation Proclamation positively affected the Union’s Civil War efforts, since it demoralized the South and meant that any slaves who could escape their captors would legally be free, and many of them would then actively help the Union war effort against the South.
Because they wanted religious freedom from the British government
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U.S. victory in the war produced a peace treaty that compelled the Spanish to relinquish claims on Cuba, and to cede sovereignty over Guam, Puerto Rico, and the Philippines to the United States. The United States also annexed the independent state of Hawaii during the conflict.
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