What central issues drew the United States deeper into international politics in the early years of the 20th century?
Since you have tagged this with WWI and other such tags, I will assume that you are taking "the early years of the century" to extend at least until 1920.
If so, the major issue that drew the United States deeper into international politics was the issue of the freedom of the seas. This went together well with the idea of "open...
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