The current debate echoes earlier eras when the United States expanded its territory through negotiated purchases, events that profoundly shaped the nation’s map.

Louisiana, California, Alaska and more: Top 8 territorial purchases made by the United States

Hair samples of three US presidents are being sent into space. Here's why

Many presidents have radically changed US foreign policy. Truman created his own doctrine. Carter gave up the Panama Canal. But a presidential historian sees danger in Trump's decision-making style

Opinion: After Iran deal turnaround, how Trump handles setbacks is what matters now

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Louisiana, California, Alaska and more: Top 8 territorial purchases made by the United States

Hair samples of three US presidents are being sent into space. Here's why

Opinion: After Iran deal turnaround, how Trump handles setbacks is what matters now