1) wars should be banned as a nation could win a war but in a war always humanity looses. To win a country we kill their soldiers which is against humanity not only oppositions soldiers die but our soldiers die too. So we should not promote war but it should be banned.
2) by wars a lot of money is wasted in buying war equipments which can rather be used in the sake of country for their upliftment like teaching poor children's, distributing clothes and food etc.
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ya thank you so much :)