Group 1: Historical Context of Income Tax - The first income tax in the US was created by Abraham Lincoln in 1861 to fund the Union side of the Civil War, initially set at a flat rate of 3% on incomes over $800, later amended to a tiered structure in 1862 [1][3] - The income tax was rescinded in 1872 due to public outcry, but it was revived in 1913 under President Woodrow Wilson and escalated during World War II, leading to significant growth in taxation since the 1960s [6] Group 2: Tax Structure and Inequality - The current federal income tax system has seven tiers: 10%, 12%, 22%, 24%, 32%, 35%, and 37%, with marginal rates meaning individuals only pay the higher rate on income that exceeds the threshold for each bracket [9] - The top 50% of earners in the US, those earning over $50,339, pay 97% of all federal income tax, with the top 1% (earning over $663,164) contributing 40% of the total [15] Group 3: Political Perspectives on Taxation - The Republican platform generally advocates for reduced taxes and a smaller federal government, while Democrats support increased taxation and expanded federal power, leading to a sharp divide in opinions on income tax [5][6] - The concept of "fairness" in taxation is debated, with differing views on whether higher earners should pay more due to their success or if they should not be penalized for their achievements [5][6]