1803 — Louisiana Purchase Treaty established western boundary of United States. 1818 — Convention with Britain established northern boundary of Louisiana Territory. 1819 — Adams-Onís Treaty granted Florida to United States. 1842 — Webster-Ashburton Treaty established Maine- Canada border. 1846 — Treaty of Oregon established northern boundary of Oregon Territory. The time line shows that the major way the United States gained territory in the early 19th century was through A. war B. diplomacy C. executive orders D. arbitration Reason click to collapse contents Listen

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