Question

Imagine you were born in 1830. Throughout your life, you witness one momentous change after another.

Answer 1

Dearest great-granddaughter, 
I have been through thick and thin, hardships and moments I will remember forever. I am passing this on to you, for I know I may die soon but you will surely live on to the 2000th century. Below is enclosed the changes I have been through and advice to help you through them in the future. 
  Wars are awful,terrible,terrible things; it hurts the lives of many. As soon as you think everything is better it gets worse again. You find everything around you crashing down. My advice on this is: stay strong and believe in what you know is right. Military has never been an easy topic. I cry for fear of what may happen to you, but no matter what, STAY STRONG. This is important no matter what.
  All through your life, you will find people changing and growing into different lifestyles. This is okay. Culture is meant to change, my dear. Choose what you feel is right and live it out with all your might. Culture is what makes us unique. We all have at least a little bit of variation.
  Now for science and technology. Oh, the times, they are changing! It seems every day a new man finds a solution to a problem he has been searching for for years! First, it was that man Thomas Edison, presenting the light bulb and now W.H. Carrier patents the design of the air conditioner! Oh, I'm sure soon there will be a different type of telephone and all these fascinating things to imagine! I do wish I could watch it all, but I'm afraid my days are numbered.
  I love you, dear, and I hope that this will help you find your way through life. Embrace the bad things that happen, so you can love the good things even more. I love you with all my heart.
With Love,
So-and-so