In the first days of January, Secretary of State Marco Rubio escalated tensions across the Americas by signaling that Cuba could be targeted following U.S. actions and threats toward Venezuela. This is not abstract rhetoric. When senior officials talk this way, history shows that sanctions, covert actions, and military force often follow. The United States has seen this playbook before, and it ends in suffering. U.S. interventions in Latin America have destabilized entire societies, fueled mass displacement, and cost countless lives — while failing to deliver democracy or peace. The renewed drumbeat against Cuba and Venezuela risks igniting a wider regional crisis at a moment when millions are already facing economic hardship and climate-driven instability. Congress must use its constitutional authority now to block funding, deny authorizations, and halt any covert or overt actions that could lead to war. Warnings are clear. United Nations officials and human rights experts have repeatedly documented how U.S. sanctions and threats worsen shortages of food, medicine, and fuel, hitting civilians first. According to congressional and international assessments, decades of pressure on Cuba and Venezuela have failed to produce political change while deepening humanitarian harm and regional migration. The urgency could not be greater. Budget negotiations, foreign policy votes, and military funding decisions are approaching in the coming weeks. Once money is allocated or authority is quietly expanded, it may be too late to stop escalation. Congress must act before threats turn into bombs. We demand immediate action to block any attacks, reject regime-change policies, and commit the United States to diplomacy and peace in the Americas. Sign now and tell Congress: stop the march to war — no attacks on Cuba, no escalation in Latin America, and no more U.S.-driven violence in our hemisphere.