Significant changes enacted at the national levels included the imposition of an income tax with the Sixteenth Amendment, direct election of Senators with the Seventeenth Amendment, Prohibition with the Eighteenth Amendment, election reforms to stop corruption and fraud, and women's suffrage through the Nineteenth century
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Diaz was a military general and his military prowess helped him advance against the previous regime in Mexico, but he was formally elected as president in 1877 and then served seven terms as Mexico's president. He established a strong centralized power in the country, and there was economic advancement. But the economic advancement benefited only a few. The vast rural populations were not helped; in fact, many peasants had their lands taken from them. So I'd go with answer D -- the increasing gap between rich and poor was a source of economic and political instability.
Answer:
Manifest destiny was that American believed to take all land as it belong to them from the creek Indians kicking them out from their own home which means they didn't took creek Indians into consideration