For decades, rebels in Cuba had waged an intermittent campaign for freedom from Spanish colonial rule. By 1895, the conflict had expanded to a war for Cuban independence. As war engulfed the island, Spanish reprisals against the rebels grew ever harsher. American public opinion favored the rebels, and McKinley shared in their outrage against Spanish policies. However while public opinion called for war to liberate Cuba, McKinley favored a peaceful approach, hoping that through negotiation, Spain might be convinced to grant Cuba independence, or at least to allow the Cubans some measure of autonomy. The United States and Spain began negotiations on the subject in 1897, but it became clear that Spain would never concede Cuban independence, while the rebels (and their American supporters) would never settle for anything less.