While Einstein gave many speeches and wrote many essays during this era (including the famous "The War Is Won, But Peace Is Not" address), the core of what is often quoted as his stance on the "menace of mass destruction" can be found in his articles for The New York Times and his speeches to the scientific community.
He argued that advancements in technology and the potential for rapid destruction had rendered geographical borders obsolete, creating a shared global destiny. A Plea for World Government: albert einstein the menace of mass destruction full speech
When the bombs fell on Hiroshima and Nagasaki in 1945, the world changed forever, and so did Einstein. He was devastated by the application of his theoretical work. He famously remarked, "Woe is me," recognizing that his equation had birthed a monster. From that moment until his death in 1955, Einstein used his global platform to speak against the very weapons his science had helped create. While Einstein gave many speeches and wrote many