What does this joke mean?

so my school uses this site: school notes well anyways they have daily joke and i dont get todays joke.. what does it mean??? here it is: A display of flags was set up in a kindergarten class. "What flag is this?" asked the teacher. "That's the flag of my country," answered one of the... show more so my school uses this site: school notes well anyways they have daily joke and i dont get todays joke.. what does it mean???
here it is:
A display of flags was set up in a kindergarten class. "What flag is this?" asked the teacher.
"That's the flag of my country," answered one of the brightest young students.
"And what's the name of your country?" the teacher asked.
"'Tis of Thee," replied the child.
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