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Income tax is a tax that states that the more money that you make, the bigger your percentage will be that you have to pay to the government. While if you make less money, the smaller your percentage of money will be that you have to pay.
https://www.investopedia.com/terms/i/incometax.asp

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The Federal Reserve act is when we established the Federal Reserve system as the central bank of the United States. This provided the US with a safer, more flexible, and a more stable financial system.
https://www.federalreserve.gov/aboutthefed/fract.htm

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The 16th amendment establishes the congress right to impose a federal income tax. A federal income tax is where the more money you make, the more money the federal government takes. This money that they were taking helped improve building, public transportation, education, etc.
https://www.archives.gov/milestone-documents/16th-amendment

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The 17th Amendment states that two senators from each state (chosen by the people) get to vote, but prior to this law, these senators were chosen by state legislature. Each of these senators get six-year-terms.
https://www.archives.gov/milestone-documents/17th-amendment