# data[].attributes.headline
The first African slaves arrive on American shores

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The first African slaves arrive on American shores

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The first transcontinental railroad connects the East and West coasts

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The first transcontinental railroad connects the East and West coasts

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Abraham Lincoln issues the Emancipation Proclamation

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Abraham Lincoln issues the Emancipation Proclamation

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Oregon Territory is added to the United States

# data[].attributes.subject
Oregon Territory is added to the United States