Historically, the 19th century is defined by annexations and internal turmoil. For instance, the Treaty of Guadalupe Hidalgo in 1848 gave more than half of Mexican territory to the United States.

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“Historically, the 19th century is defined by annexations and internal turmoil. For instance, the Treaty of Guadalupe Hidalgo in 1848 gave more than half of Mexican territory to the United States.”