Plug these numbers into your spreadsheet software and make a bar chart out of them if you don't think we are being invaded.

Allied Invasion of Normandy 154,000
Troops in Iraq 150,000
North Korean Army 1,000,000
People's Liberation Army, China (1990) 3,000,000
illegal aliiens in the US 20,000,000

The chart will blow your mind, the illegal aliens absolutely dwarf all other armies or invasions.