what the united states has fought for

By far the most costly war in terms of human life was World War II (1939–45), in which the total number of fatalities, including battle deaths and civilians of all countries, is estimated to have been 56.4 million, assuming 26.6 million Soviet fatalities and 7.8 million Chinese civilians were killed.

Did more soldiers died in ww1 or ww2?

More than one million British military personnel died during the First and Second World Wars, with the First World War alone accounting for 886,000 fatalities. Nearly 70,000 British civilians also lost their lives, the great majority during the Second World War.

Who had the biggest army ever?

The United States lays claim to the largest army ever seen in the history of the world. This force was assembled and deployed during World War II. When the United States military was at its largest, there were more than 12 million individuals enlisted in the different branches of the United States armed forces.