Here’s a completed timeline based on the events you've provided:
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1869 - Connected the east and west coasts of the United States; facilitated Westward expansion (Transcontinental Railroad).
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1890 - Passed to limit the power of monopolies and promote fair competition in business (Sherman Antitrust Act).
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1890's - Major immigration stations begin, processing immigrants from Europe and Asia (Ellis Island and Angel Island).
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1892 - Rockefeller begins Standard Oil; Carnegie begins Carnegie Steel.
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1890's - Trusts and Monopolies control industry.
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1890's - Rapid industrialization calls for better workers' rights and working conditions, leading to the growth of labor unions.
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Resistance of Westward Expansion, resulting in conflicts like the Battle of Little Bighorn (Plains Indians' Resistance).
Feel free to rearrange or add more details if needed!