What comes with independence is the freedom to make your own decisions and do what you want without fear of restriction or consequences from some higher authority. If you make it clear to the world, you are declaring that no one can own you and tell you want to do or what rule you can follow.
To honor the ones who lost their lives during the battle (hope this helped!)
To make something nice to them
AN 1848 POLITICAL PAMPHLET BY GERMAN PHILOSOPHERS KARL MARX AND FRIEDERICH ENGELS.