The 1798 rebellion led by the United Irishmen aimed to establish an Irish republic through the unification of Protestants, Catholics, and dissenters, inspired by the French Revolution. The rebellion encountered disorganization and was ultimately suppressed by British forces, resulting in significant sectarian violence and the execution of key leaders, including Wolfe Tone. The aftermath contributed to increased sectarian conflict and the eventual abolition of the Irish Parliament in 1801 through the Act of Union.