What is the main advantage of using a credit card?

It is time saving.
it is quick and efficient

The main advantage of using a credit card is to get money

Sixty percent of Americans viewed the United States intervening in WWI as a mistake.  As of August of 1914, the US was officially a neutral state when it came to the whole debacle that was happening in Europe.  However, the large bank corporations like J.P. Morgan loaned the Allies WY more money than they should have, which then meant we were on the side of the Allies.  Basically, it wasn't the people's desire to be in the war, but it was the banks that launched us into it.