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The "one" in "please buy one" refers to "a chance" in the previous line. "Please buy one [chance that peace will come]". Buying a ticket in a raffle (with the hopes of winning a prize) is popularly referred to as "buying a chance".
The "one" in "please buy one" refers to "a chance" in the previous line. "Please buy one [chance that peace will come]". Buying a ticket in a raffle (with the hopes of winning a prize) is popularly referred to as "buying a chance".