i would like to visit usa without invitation letter the usa consulate can provide any source to

i want to see usa cities how it is possible. without invitatoin how i will come.there is any solution to me.so please give me reply to me my answer.why should i can travel without invitation letter.i have no my friends or relatives. so what can i do.so if could not visit to usa.i have no right to see your country without invitation letter.tell me what is your opinion about your country.we are touristors of your country.income is gaining from our side to your country.why should want invitation letter to us .we have the details to how many days we have to stay. arrival&departure flight ticket should be take.hotel accommodation to show to your cosulate.