Answer:
<u><em>William H. Seward</em></u>
Explanation:
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Impeachment proceedings against the president came when Johnson breached the Tenure of Office Act by removing Edwin Stanton, Secretary of War, from the cabinet.
The correct answer is: B. The increase in the labor unions' political power
Labor Unions were on the rise during the Progressive Era and this enabled Debs, a socialist, to come to power.
The United States tried to overthrow communist leader Fidel Castro in Cuba.
The Anglo-Boer War or Second Boer War was fought between 1899 and 1902 by the British Empire and two Boer states, the South African Republic and the Orange Free State.
At the beginning of the conflict the British were overconfident while the Boer states were very well prepared. In the end, the British managed to defeat the Boers and the two states were incorporated to the Union of South Africa, part of the British Empire, in 1910.