A joke about patriotism

French celebrity Bogart ridiculed the short history of Americans, saying that "Americans often miss their ancestors when they are free, but when they think of their grandparents, they can't help but stop." Mark Twain retaliated by saying, "The French are free. They always want to know who their father is, but it is difficult to know who their mother is."

It means:

The French joked about the short history of Americans, because the United States existed as a British colony for a long time before and after his grandfather's generation, and changed its name to the United States after declaring independence.

As an American, Mark Twain hit back, satirizing the French for being too open in their private lives.

Summary: celebrity stories, you deserve it.