The law of attraction is a very powerful law that simply states that like attracts like. Everything in the Universe is energy vibrating at specific frequencies. Your body is also energy vibrating at specific frequencies. As you give your attention to anything, the past, present, or future, you begin to vibrate like that which you are giving your attention and you attract experiences that are of a similar nature.
Although history seems like it is set in stone to many people around the world, history is truly malleable, because history is only a memory of what happened, not what actually happened. Memories are vibrational reverberations of the past that are only vibrational frequencies of a similar nature compared to past vibrational frequencies that have previously existed.
When you are remembering something though, you are activating the vibration of that memory within yourself and you begin to vibrate in harmony with that memory. You can see evidence of this vibrational relationship by observing the way you feel as you think about a memory. The way you feel is an indicator of your personal vibrational frequency. Since the law of attraction states that like attracts like, when you are vibrating in harmony with that specific vibrational frequency, the vibrational frequency of the memory, you will attract experiences that are of a similar nature into your experience, or in other words, you will attract vibrational frequencies that are of a similar frequency.
As you can see, history has no bearing on the present unless someone gives history their attention. If you do not give your attention to what has happened in the past, you cannot get more of what has happened in the past, because you are vibrating at a different vibrational frequency. If you do give your attention to what has happened in the past though, you will attract experiences of a similar nature into your life, because you are vibrating in harmony with what has happened in the past.
You can also create repetitive experiences as well if you only give your attention to what is. If you are wondering why one experience continues to repeat itself in your life, it may be repeating itself due to your remembering of an experience you had that was similar to it, but it could also be repeating itself due to your focusing upon vibrational frequencies of a similar nature in your present. The present is only a culmination of what you have been giving your attention to in the past. If you stop giving your attention to the experience that keeps repeating itself, it will no longer be able to repeat itself, because you are vibrating at a different vibrational frequency.
History can be useful if you want to recreate an experience that you had in the past though. If you simply remember an experience you had in the past that you would like to create again, you will recreate it by vibrating in harmony with it as you give it your attention. As you give the experience you had in the past your attention, you will begin to vibrate in harmony with it and you will attract experiences that are of a similar vibrational frequency into your life.
Since the law of attraction is always in action, you should definitely do your best to give your attention to subjects, and even memories, that make you feel good. By doing so, you can attract good feeling experiences into your life. If you have a memory that you wish were different in any way, simply change it in your mind to match your newfound preferences. While this change may seem superficial at first, you will soon realize that you have changed your point of attraction, the way you feel, and you have hence changed the type of experiences you are attracting into your life.