What event caused napoleon 3 to believe his invasion of Mexico could be successful?

Napoleon III believed his invasion of Mexico could be successful following the American Civil War, which weakened the United States and diminished its ability to intervene in Latin America. Additionally, the French victory at the Battle of Puebla in 1862 and the subsequent capture of Mexico City boosted his confidence in establishing a puppet regime under Emperor Maximilian I. The prevailing notion of Manifest Destiny also suggested that European powers could reclaim influence in the Americas, further encouraging Napoleon III's ambitions.