Just some statistics: In World II, the US lost about 400,000 soldiers and civilians killed, or about 0.31% of our population of about 131 million (in 1939). Canada lost about 43,600 soldiers and civilians or about 0.38% of it's population of about 11 million. Germany lost about 7 million soldiers and civilians, or about 8.5% of it's population of 83.5 million. The Soviet Union lost about 26.5 million soldiers and civilians, or about 13.5% of it's population of about 194 million.
In Vietnam, the US lost a bit over 58,000 soldiers and civilians killed, or about 0.03% of our population of about 200 million in 1968.
All numbers are rounded.
Sourced here.
Mike