They were known as Federalists. Those who opposed the Constitution were known as Anti-Federalists.
Answer: 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
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The war occurred because Mexico severed connenctions with the US after they (US) aquired Texas. On May 13th, Congress overwhelmingly approved a declaration of war. They entered the war divided. Democrats favored the conflict. Many viewed it as conscienceless land grabbing.