The Revolutionary Alliance, founded by Sun Yat-sen in 1905, was a political organization aimed at overthrowing the Qing dynasty and establishing a republic in China. This alliance united various anti-Qing factions and represented a significant step towards modernizing China, advocating for nationalism, democracy, and people's livelihood. It played a critical role in mobilizing support for the 1911 Revolution that eventually led to the end of imperial rule in China.