In 2023 alone, illegal immigration cost taxpayers $150.7 billion.
To put this in context with other costs (adjusted for inflation):
World War I: $334 billion
Apollo Space Program: $257 billion
Manhattan Project: $30 billion
Panama Canal: $15.2 billion
Hoover Dam: $1 billion
Sources:
https://online.norwich.edu/online/about/resource-library/cost-us-wars-then-and-now…
https://planetary.org/space-policy/cost-of-apollo…
https://stimson.org/2024/americas-nuclear-weapons-quagmire/…
https://panamacascoviejo.com/brief-history-of-the-panama-canal/…