This is factually incorrect. Here are the estimates for the rates of support for each conflict at the beginning of the conflict:
- Iraq (Gulf War): 75-80%
- Iraq (2003): 65-76%
- Syria: 35-50%
- Vietnam: 65-75%
- Iran: 42%
Alexander Hamilton wrote that governance should involve people with “wisdom to discern” and “virtue to pursue the common good”. The US is not a direct democracy; it is a constitutional republic. The definition of what constitutes American interests is literally whatever the United States federal government says it is.