What events occurred between 1850 and 1900 and 1900 and 1950 that influenced the size of the national debt?.

Between 1850 and 1900, the US national debt was largely influenced by the Civil War, which increased the debt from $65 million to $2.7 billion. Between 1900 and 1950, the US national debt was influenced by World War I, which increased the debt from $1.2 billion to $25.5 billion, and World War II, which increased the debt from $43 billion to $269 billion. Additionally, the Great Depression of the 1930s caused the debt to increase from $16.2 billion to $43 billion.